#include <bits/stdc++.h>
using namespace std;

int main() {
  int64_t a, b, c;
  cin >> a >> b >> c;
  if (a == b || b == c || c == a || ((b != max({a, b, c})) && (b != min({a, b, c})))) {
    cout << 0 << endl;
  }
  else {
    cout << min({abs(a - b), abs(b - c), abs(c - a)}) << endl;
  }
  return 0;
}