#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 123;
const int M = 1e7 + 123;
const int inf = 1e9 + 1;
const int mod = 1e9 + 7;
const int bl = 300;
int a[4], cnt;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  for (int i = 1; i <= 3; ++i) {
    cin >> a[i];
  }
  sort(a + 1, a + 4);
  cout << (a[2] - a[1]) + (a[3] - a[2]);
  return 0;
}
