#include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;

int main(){
	int a,b,c; scanf("%d%d%d",&a,&b,&c);
	printf("%d\n",min(a>b?min(a,c)-b:b-max(a,c),abs(a-c)));
	return 0;
}