import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;


public class Main {
  public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  }

}


class FastScanner {
	public static String debug = null;

	private final InputStream in = System.in;
	private int ptr = 0;
	private int buflen = 0;
	private byte[] buffer = new byte[1024];
	private boolean eos = false;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	}

	public boolean isEOS() {
		return this.eos;
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		return (int) nextLong();
	}

	public long[] nextLongList(int n) {
		return nextLongTable(1, n)[0];
	}

	public int[] nextIntList(int n) {
		return nextIntTable(1, n)[0];
	}

	public long[][] nextLongTable(int n, int m) {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	}

	public int[][] nextIntTable(int n, int m) {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	}
} import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.util.NoSuchElementException; NoSuchElementException java.util public class Main {
  public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  }

} Main public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  } main {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  } FastScanner sc = new FastScanner(); sc new FastScanner() int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc int B = sc.nextInt(); B sc.nextInt() sc.nextInt sc int C = sc.nextInt(); C sc.nextInt() sc.nextInt sc int D = sc.nextInt(); D sc.nextInt() sc.nextInt sc int[] time = new int[101]; time new int[101] 101 for (int i = A; i < B; i ++) {
      time[i] ++;
    } int i = A; int i = A; i A i < B i B i ++ i ++ i {
      time[i] ++;
    } {
      time[i] ++;
    } time[i] ++ time[i] time i for (int i = C; i < D; i ++) {
      time[i] ++;
    } int i = C; int i = C; i C i < D i D i ++ i ++ i {
      time[i] ++;
    } {
      time[i] ++;
    } time[i] ++ time[i] time i int count = 0; count 0 for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    } int i = 0; int i = 0; i 0 i < time.length i time.length time time.length i ++ i ++ i {
      if (time[i] == 2) {
        count ++;
      }
    } {
      if (time[i] == 2) {
        count ++;
      }
    } if (time[i] == 2) {
        count ++;
      } time[i] == 2 time[i] time i 2 {
        count ++;
      } count ++ count System.out.println(count) System.out.println System.out System System.out count String[] args args class FastScanner {
	public static String debug = null;

	private final InputStream in = System.in;
	private int ptr = 0;
	private int buflen = 0;
	private byte[] buffer = new byte[1024];
	private boolean eos = false;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	}

	public boolean isEOS() {
		return this.eos;
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		return (int) nextLong();
	}

	public long[] nextLongList(int n) {
		return nextLongTable(1, n)[0];
	}

	public int[] nextIntList(int n) {
		return nextIntTable(1, n)[0];
	}

	public long[][] nextLongTable(int n, int m) {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	}

	public int[][] nextIntTable(int n, int m) {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	}
} FastScanner public static String debug = null; debug null private final InputStream in = System.in; in System.in System System.in private int ptr = 0; ptr 0 private int buflen = 0; buflen 0 private byte[] buffer = new byte[1024]; buffer new byte[1024] 1024 private boolean eos = false; eos false private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	} hasNextByte {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	} if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		} ptr < buflen ptr buflen {
			return true;
		} return true; true {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		} ptr = 0 ptr 0 try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} IOException e {
				e.printStackTrace();
			} e.printStackTrace() e.printStackTrace e {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				} debug != null debug null {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} buflen = debug.length() buflen debug.length() debug.length debug buffer = debug.getBytes() buffer debug.getBytes() debug.getBytes debug debug = "" debug "" eos = true eos true {
					buflen = in.read(buffer);
				} buflen = in.read(buffer) buflen in.read(buffer) in.read in buffer if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			} buflen < 0 buflen 0 {
				eos = true;
				return false;
			} eos = true eos true return false; false if (buflen == 0) {
				return false;
			} buflen == 0 buflen 0 {
				return false;
			} return false; false return true; true private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	} readByte {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	} if (hasNextByte())
			return buffer[ptr++];
		else
			return -1; hasNextByte() hasNextByte return buffer[ptr++]; buffer[ptr++] buffer ptr++ ptr return -1; -1 1 private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	} isPrintableChar {
		return 33 <= c && c <= 126;
	} return 33 <= c && c <= 126; 33 <= c && c <= 126 33 <= c 33 c c <= 126 c 126 int c c private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	} skipUnprintable {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	} while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++; hasNextByte() && !isPrintableChar(buffer[ptr]) hasNextByte() hasNextByte !isPrintableChar(buffer[ptr]) isPrintableChar(buffer[ptr]) isPrintableChar buffer[ptr] buffer ptr ptr++ ptr public boolean isEOS() {
		return this.eos;
	} isEOS {
		return this.eos;
	} return this.eos; this.eos this this.eos public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	} hasNext {
		skipUnprintable();
		return hasNextByte();
	} skipUnprintable() skipUnprintable return hasNextByte(); hasNextByte() hasNextByte public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	} next {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	} if (!hasNext())
			throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() StringBuilder sb = new StringBuilder(); sb new StringBuilder() int b = readByte(); b readByte() readByte while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		} isPrintableChar(b) isPrintableChar b {
			sb.appendCodePoint(b);
			b = readByte();
		} sb.appendCodePoint(b) sb.appendCodePoint sb b b = readByte() b readByte() readByte return sb.toString(); sb.toString() sb.toString sb public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	} nextLong {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	} if (!hasNext())
			throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() long n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
			minus = true;
			b = readByte();
		} b == '-' b '-' {
			minus = true;
			b = readByte();
		} minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		} b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
			throw new NumberFormatException();
		} throw new NumberFormatException(); new NumberFormatException() while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		} true {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		} if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			} '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
				n *= 10;
				n += b - '0';
			} n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			} b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
				return minus ? -n : n;
			} return minus ? -n : n; minus ? -n : n minus -n n n {
				throw new NumberFormatException();
			} throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public int nextInt() {
		return (int) nextLong();
	} nextInt {
		return (int) nextLong();
	} return (int) nextLong(); (int) nextLong() nextLong public long[] nextLongList(int n) {
		return nextLongTable(1, n)[0];
	} nextLongList {
		return nextLongTable(1, n)[0];
	} return nextLongTable(1, n)[0]; nextLongTable(1, n)[0] nextLongTable(1, n) nextLongTable 1 n 0 int n n public int[] nextIntList(int n) {
		return nextIntTable(1, n)[0];
	} nextIntList {
		return nextIntTable(1, n)[0];
	} return nextIntTable(1, n)[0]; nextIntTable(1, n)[0] nextIntTable(1, n) nextIntTable 1 n 0 int n n public long[][] nextLongTable(int n, int m) {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	} nextLongTable {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	} long[][] ret = new long[n][m]; ret new long[n][m] n m for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		} int i = 0; int i = 0; i 0 i < n i n i ++ i ++ i {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		} {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		} for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			} int j = 0; int j = 0; j 0 j < m j m j ++ j ++ j {
				ret[i][j] = nextLong();
			} {
				ret[i][j] = nextLong();
			} ret[i][j] = nextLong() ret[i][j] ret[i] ret i j nextLong() nextLong return ret; ret int n n int m m public int[][] nextIntTable(int n, int m) {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	} nextIntTable {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	} int[][] ret = new int[n][m]; ret new int[n][m] n m for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		} int i = 0; int i = 0; i 0 i < n i n i ++ i ++ i {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		} {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		} for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			} int j = 0; int j = 0; j 0 j < m j m j ++ j ++ j {
				ret[i][j] = nextInt();
			} {
				ret[i][j] = nextInt();
			} ret[i][j] = nextInt() ret[i][j] ret[i] ret i j nextInt() nextInt return ret; ret int n n int m m public class Main {
  public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  }

} public class Main {
  public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  }

} Main
import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;


public class Main {
  public static void main(String[] args) {
    FastScanner sc = new FastScanner();
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();
    int D = sc.nextInt();
    
    int[] time = new int[101];
    
    for (int i = A; i < B; i ++) {
      time[i] ++;
    }
    for (int i = C; i < D; i ++) {
      time[i] ++;
    }
    
    int count = 0;
    for (int i = 0; i < time.length; i ++) {
      if (time[i] == 2) {
        count ++;
      }
    }
    System.out.println(count);
  }

}


class FastScanner {
	public static String debug = null;

	private final InputStream in = System.in;
	private int ptr = 0;
	private int buflen = 0;
	private byte[] buffer = new byte[1024];
	private boolean eos = false;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	}

	public boolean isEOS() {
		return this.eos;
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		return (int) nextLong();
	}

	public long[] nextLongList(int n) {
		return nextLongTable(1, n)[0];
	}

	public int[] nextIntList(int n) {
		return nextIntTable(1, n)[0];
	}

	public long[][] nextLongTable(int n, int m) {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	}

	public int[][] nextIntTable(int n, int m) {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	}
}