#include <bits/stdc++.h>

using namespace std;
typedef pair<int, int> P;
typedef pair<P, P> P2;

int main() {
  vector<int> x(3);
  for (int i = 0; i < 3; ++i) cin >> x[i];

  int ans = 1234567890;
  for (int i = 0; i < 3; ++i) {
    for (int j = 0; j < 3; ++j) {
      if (i == j) continue;
      ans = min(ans, abs(x[i] - x[j]));
    }
  }
  cout << ans << '\n';
  return 0;
}