import java.util.*; 
import java.io.*;

public class Main {
	static int dp[] = new int[500001]; 
	static int n = 0; 
	static int a[]; 
	public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	}
	public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	}
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	}
}

class InputReader{
	private InputStream stream;
	private byte[] buf = new byte[1024];
	private int curChar;
	private int numChars;
	private SpaceCharFilter filter;

	 public InputReader(InputStream stream) {
		this.stream = stream;
	}

     public int read() {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	}

     public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}

     public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	}

     public long readLong() {
		int c = read();
		while (isSpaceChar(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}
	
     public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}
     
     public String next() {
		return readString();
	}
    
     public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	}
} import java.util.*; util.* java import java.io.*; io.* java public class Main {
	static int dp[] = new int[500001]; 
	static int n = 0; 
	static int a[]; 
	public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	}
	public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	}
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	}
} Main static int dp[] = new int[500001]; dp new int[500001] 500001 static int n = 0; n 0 static int a[]; a public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	} func {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	} if(ind == n - 1) return 0; ind == n - 1 ind n - 1 n 1 return 0; 0 if(ind >= n) return Integer.MAX_VALUE; ind >= n ind n return Integer.MAX_VALUE; Integer.MAX_VALUE Integer Integer.MAX_VALUE if(dp[ind] != -1) return dp[ind]; dp[ind] != -1 dp[ind] dp ind -1 1 return dp[ind]; dp[ind] dp ind int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); left Math.abs(a[ind] - a[ind + 1]) + func(ind+1) Math.abs(a[ind] - a[ind + 1]) Math.abs Math a[ind] - a[ind + 1] a[ind] a ind a[ind + 1] a ind + 1 ind 1 func(ind+1) func ind+1 ind 1 int right = Integer.MAX_VALUE; right Integer.MAX_VALUE Integer Integer.MAX_VALUE if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 2 + ind < n 2 + ind 2 ind n right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2) right Math.abs(a[ind] - a[ind + 2]) + func( ind + 2) Math.abs(a[ind] - a[ind + 2]) Math.abs Math a[ind] - a[ind + 2] a[ind] a ind a[ind + 2] a ind + 2 ind 2 func( ind + 2) func ind + 2 ind 2 return dp[ind] = Math.min(right, left); dp[ind] = Math.min(right, left) dp[ind] dp ind Math.min(right, left) Math.min Math right left int ind ind public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	} solve {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	} n = in.readInt() n in.readInt() in.readInt in a = new int[n] a new int[n] n Arrays.fill(dp, -1) Arrays.fill Arrays dp -1 1 for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		} int i = 0; int i = 0; i 0 i<n i n i++ i++ i {
			a[i] = in.readInt(); 
		} {
			a[i] = in.readInt(); 
		} a[i] = in.readInt() a[i] a i in.readInt() in.readInt in System.out.println(func(0)) System.out.println System.out System System.out func(0) func 0 InputReader in in public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	} main {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	} InputReader in = new InputReader(System.in); in new InputReader(System.in) int t = 1; t 1 while(t-- > 0) {
			solve(in); 
		} t-- > 0 t-- t 0 {
			solve(in); 
		} solve(in) solve in String[] args args class InputReader{
	private InputStream stream;
	private byte[] buf = new byte[1024];
	private int curChar;
	private int numChars;
	private SpaceCharFilter filter;

	 public InputReader(InputStream stream) {
		this.stream = stream;
	}

     public int read() {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	}

     public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}

     public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	}

     public long readLong() {
		int c = read();
		while (isSpaceChar(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}
	
     public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}
     
     public String next() {
		return readString();
	}
    
     public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	}
} InputReader private InputStream stream; stream private byte[] buf = new byte[1024]; buf new byte[1024] 1024 private int curChar; curChar private int numChars; numChars private SpaceCharFilter filter; filter public InputReader(InputStream stream) {
		this.stream = stream;
	} InputReader {
		this.stream = stream;
	} this.stream = stream this.stream this this.stream stream InputStream stream stream public int read() {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	} read {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	} if (numChars == -1)
			throw new InputMismatchException(); numChars == -1 numChars -1 1 throw new InputMismatchException(); new InputMismatchException() if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		} curChar >= numChars curChar numChars {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		} curChar = 0 curChar 0 try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			} catch (IOException e) {
				throw new InputMismatchException();
			} IOException e {
				throw new InputMismatchException();
			} throw new InputMismatchException(); new InputMismatchException() {
				numChars = stream.read(buf);
			} numChars = stream.read(buf) numChars stream.read(buf) stream.read stream buf if (numChars <= 0)
				return -1; numChars <= 0 numChars 0 return -1; -1 1 return buf[curChar++]; buf[curChar++] buf curChar++ curChar public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	} readInt {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	} int c = read(); c read() read while (isSpaceChar(c))
			c = read(); isSpaceChar(c) isSpaceChar c c = read() c read() read int sgn = 1; sgn 1 if (c == '-') {
			sgn = -1;
			c = read();
		} c == '-' c '-' {
			sgn = -1;
			c = read();
		} sgn = -1 sgn -1 1 c = read() c read() read int res = 0; res 0 do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} if (c < '0' || c > '9')
				throw new InputMismatchException(); c < '0' || c > '9' c < '0' c '0' c > '9' c '9' throw new InputMismatchException(); new InputMismatchException() res *= 10 res 10 res += c - '0' res c - '0' c '0' c = read() c read() read return res * sgn; res * sgn res sgn public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	} readString {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	} int c = read(); c read() read while (isSpaceChar(c))
			c = read(); isSpaceChar(c) isSpaceChar c c = read() c read() read StringBuilder res = new StringBuilder(); res new StringBuilder() do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
			res.appendCodePoint(c);
			c = read();
		} res.appendCodePoint(c) res.appendCodePoint res c c = read() c read() read return res.toString(); res.toString() res.toString res public long readLong() {
		int c = read();
		while (isSpaceChar(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	} readLong {
		int c = read();
		while (isSpaceChar(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	} int c = read(); c read() read while (isSpaceChar(c)) {
			c = read();
		} isSpaceChar(c) isSpaceChar c {
			c = read();
		} c = read() c read() read int sgn = 1; sgn 1 if (c == '-') {
			sgn = -1;
			c = read();
		} c == '-' c '-' {
			sgn = -1;
			c = read();
		} sgn = -1 sgn -1 1 c = read() c read() read long res = 0; res 0 do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} if (c < '0' || c > '9') {
				throw new InputMismatchException();
			} c < '0' || c > '9' c < '0' c '0' c > '9' c '9' {
				throw new InputMismatchException();
			} throw new InputMismatchException(); new InputMismatchException() res *= 10 res 10 res += c - '0' res c - '0' c '0' c = read() c read() read return res * sgn; res * sgn res sgn public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	} isSpaceChar {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	} if (filter != null)
			return filter.isSpaceChar(c); filter != null filter null return filter.isSpaceChar(c); filter.isSpaceChar(c) filter.isSpaceChar filter c return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == '\t' c == '\r' c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == ' ' c ' ' c == '\n' c '\n' c == '\r' c '\r' c == '\t' c '\t' c == -1 c -1 1 int c c public String next() {
		return readString();
	} next {
		return readString();
	} return readString(); readString() readString public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	} SpaceCharFilter public boolean isSpaceChar(int ch); isSpaceChar int ch ch public class Main {
	static int dp[] = new int[500001]; 
	static int n = 0; 
	static int a[]; 
	public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	}
	public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	}
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	}
} public class Main {
	static int dp[] = new int[500001]; 
	static int n = 0; 
	static int a[]; 
	public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	}
	public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	}
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	}
} Main
import java.util.*; 
import java.io.*;

public class Main {
	static int dp[] = new int[500001]; 
	static int n = 0; 
	static int a[]; 
	public static int func(int ind) {
		if(ind == n - 1) return 0; 
		if(ind >= n) return Integer.MAX_VALUE; 
		if(dp[ind] != -1) return dp[ind]; 
		
		int left = Math.abs(a[ind] - a[ind + 1]) + func(ind+1); 
		int right = Integer.MAX_VALUE; 
		if(2 + ind < n) 
			 right = Math.abs(a[ind] - a[ind + 2]) + func( ind + 2); 
		return dp[ind] = Math.min(right, left); 
	}
	public static void solve(InputReader in) {
		n = in.readInt(); 
		a = new int[n]; 
		Arrays.fill(dp, -1);
		for(int i = 0; i<n; i++) {
			a[i] = in.readInt(); 
		}
		System.out.println(func(0)); 
	}
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in); 
		int t = 1; 
		while(t-- > 0) {
			solve(in); 
		}
	}
}

class InputReader{
	private InputStream stream;
	private byte[] buf = new byte[1024];
	private int curChar;
	private int numChars;
	private SpaceCharFilter filter;

	 public InputReader(InputStream stream) {
		this.stream = stream;
	}

     public int read() {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	}

     public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}

     public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	}

     public long readLong() {
		int c = read();
		while (isSpaceChar(c)) {
			c = read();
		}
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9') {
				throw new InputMismatchException();
			}
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}
	
     public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}
     
     public String next() {
		return readString();
	}
    
     public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	}
}
