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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  vector<int> a(3);
  cin >> a[0] >> a[1] >> a[2];
  if (a[0] == a[1] || a[1] == a[2] || a[2]== a[0]) {
    cout << 0 << endl;
    return 0;
  }
  // a[1]が２番目に大きい
  if ((a[0]>a[1]&&a[1]>a[2])||(a[0]<a[1]&&a[1]<a[2])) {
    cout << 0 << endl;
    return 0;
  }

  sort(a.begin(),a.end());
  cout << min(a[1]-a[0],a[2]-a[1]) << endl;
}