#include <stdio.h>
#include <stdlib.h>

int main(void) {

	int a, b, c;
	int ba, bc, ac;
	scanf("%d%d%d", &a, &b, &c);

	ba = abs(b - a);
	bc = abs(b - c);
	ac = abs(a - c);
	if(ba > bc){
		if(bc > ac){
			printf("%d\n", ac);
		}
		else{
			printf("%d\n", bc);
		}
	}
	else{
		if(ba < ac){
			printf("%d\n", ba);
		}
		else{
			printf("%d\n", ac);
		}
	}

	return 0;
}