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