package contest200113;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;

public class B {
	static Scanner in;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		int A = ni(), B = ni(), C = ni();
		if(!(1 <= A && A <= 1000000000))throw new RuntimeException();
		if(!(1 <= B && B <= 1000000000))throw new RuntimeException();
		if(!(1 <= C && C <= 1000000000))throw new RuntimeException();
		if(!(B < A && A < C || C < A && A < B || B < C && C < A || A < C && C < B)) {
			throw new RuntimeException();
		}
		out.println(Math.min(Math.min(Math.abs(A-B), Math.abs(B-C)), Math.abs(C-A)));
	}
	
	public static void main(String[] args) throws Exception
	{
		in = INPUT.isEmpty() ? new Scanner(System.in) : new Scanner(INPUT);
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
	}
	
	static int ni() { return Integer.parseInt(in.next()); }
	static long nl() { return Long.parseLong(in.next()); }
	static double nd() { return Double.parseDouble(in.next()); }
	static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}