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