/* -*- coding: utf-8 -*-
 *
 * 965.cc:  No.965 門松列が嫌い - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const long long LINF = 1LL << 60;

/* typedef */

/* global variables */

/* subroutines */

inline void setmin(int &a, int b) { if (a > b) a = b; }

/* main */

int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);

  printf("%d\n", min(min(abs(a - b), abs(b - c)), abs(c - a)));
  return 0;
}