#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[3], ans;
  cin >> a[0] >> a[1] >> a[2];
  sort(a, a + 3);
  ans = (a[1] - a[0]) + (a[2] - a[1]);
  cout << ans << endl;
  return 0;
}
