#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

int main(){
  int a, b, c;
  cin >> a >> b >> c;
  int res = 1e9;
  res = min(res, abs(a - b));
  res = min(res, abs(a - c));
  res = min(res, abs(b - c));
  cout << res << endl;
  return 0;
}