import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;

class Main{

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	}

	public static void main(String[] args) {
		FastReader sc = new FastReader();
		int a = sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int d1=Math.abs(b-a),d2=Math.min(Math.abs(b-a),Math.abs(c-a)),d3=Math.abs(c-b);
		int d4=Math.min(Math.abs(a-b), Math.abs(c-b)),d5=Math.abs(a-c);
		int d6=Math.min(Math.abs(a-c), Math.abs(b-c)),d7=Math.abs(a-b);
		System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7)));
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.ArrayList; ArrayList java.util import java.util.Collections; Collections java.util import java.util.List; List java.util import java.util.StringTokenizer; StringTokenizer java.util class Main{

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	}

	public static void main(String[] args) {
		FastReader sc = new FastReader();
		int a = sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int d1=Math.abs(b-a),d2=Math.min(Math.abs(b-a),Math.abs(c-a)),d3=Math.abs(c-b);
		int d4=Math.min(Math.abs(a-b), Math.abs(c-b)),d5=Math.abs(a-c);
		int d6=Math.min(Math.abs(a-c), Math.abs(b-c)),d7=Math.abs(a-b);
		System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7)));
	}
} Main public static void main(String[] args) {
		FastReader sc = new FastReader();
		int a = sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int d1=Math.abs(b-a),d2=Math.min(Math.abs(b-a),Math.abs(c-a)),d3=Math.abs(c-b);
		int d4=Math.min(Math.abs(a-b), Math.abs(c-b)),d5=Math.abs(a-c);
		int d6=Math.min(Math.abs(a-c), Math.abs(b-c)),d7=Math.abs(a-b);
		System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7)));
	} main {
		FastReader sc = new FastReader();
		int a = sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int d1=Math.abs(b-a),d2=Math.min(Math.abs(b-a),Math.abs(c-a)),d3=Math.abs(c-b);
		int d4=Math.min(Math.abs(a-b), Math.abs(c-b)),d5=Math.abs(a-c);
		int d6=Math.min(Math.abs(a-c), Math.abs(b-c)),d7=Math.abs(a-b);
		System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7)));
	} FastReader sc = new FastReader(); sc new FastReader() int a = sc.nextInt() a sc.nextInt() sc.nextInt sc b=sc.nextInt() b sc.nextInt() sc.nextInt sc c=sc.nextInt(); c sc.nextInt() sc.nextInt sc int d1=Math.abs(b-a) d1 Math.abs(b-a) Math.abs Math b-a b a d2=Math.min(Math.abs(b-a),Math.abs(c-a)) d2 Math.min(Math.abs(b-a),Math.abs(c-a)) Math.min Math Math.abs(b-a) Math.abs Math b-a b a Math.abs(c-a) Math.abs Math c-a c a d3=Math.abs(c-b); d3 Math.abs(c-b) Math.abs Math c-b c b int d4=Math.min(Math.abs(a-b), Math.abs(c-b)) d4 Math.min(Math.abs(a-b), Math.abs(c-b)) Math.min Math Math.abs(a-b) Math.abs Math a-b a b Math.abs(c-b) Math.abs Math c-b c b d5=Math.abs(a-c); d5 Math.abs(a-c) Math.abs Math a-c a c int d6=Math.min(Math.abs(a-c), Math.abs(b-c)) d6 Math.min(Math.abs(a-c), Math.abs(b-c)) Math.min Math Math.abs(a-c) Math.abs Math a-c a c Math.abs(b-c) Math.abs Math b-c b c d7=Math.abs(a-b); d7 Math.abs(a-b) Math.abs Math a-b a b System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7))) System.out.println System.out System System.out Math.min(d2+d3, Math.min(d4+d5, d6+d7)) Math.min Math d2+d3 d2 d3 Math.min(d4+d5, d6+d7) Math.min Math d4+d5 d4 d5 d6+d7 d6 d7 String[] args args static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	} FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		} FastReader {
			br = new BufferedReader(new InputStreamReader(System.in));
		} br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} next {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			} st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			} try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				} IOException e {
					e.printStackTrace();
				} e.printStackTrace() e.printStackTrace e {
					st = new StringTokenizer(br.readLine());
				} st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
			return Long.parseLong(next());
		} nextLong {
			return Long.parseLong(next());
		} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
			return Double.parseDouble(next());
		} nextDouble {
			return Double.parseDouble(next());
		} return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		} nextLine {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		} String str = ""; str "" try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} IOException e {
				e.printStackTrace();
			} e.printStackTrace() e.printStackTrace e {
				str = br.readLine();
			} str = br.readLine() str br.readLine() br.readLine br return str; str
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;

class Main{

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	}

	public static void main(String[] args) {
		FastReader sc = new FastReader();
		int a = sc.nextInt(),b=sc.nextInt(),c=sc.nextInt();
		int d1=Math.abs(b-a),d2=Math.min(Math.abs(b-a),Math.abs(c-a)),d3=Math.abs(c-b);
		int d4=Math.min(Math.abs(a-b), Math.abs(c-b)),d5=Math.abs(a-c);
		int d6=Math.min(Math.abs(a-c), Math.abs(b-c)),d7=Math.abs(a-b);
		System.out.println(Math.min(d2+d3, Math.min(d4+d5, d6+d7)));
	}
}