#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <cstdlib>
#include <queue>

using namespace std;

typedef long long int ll;
typedef pair<int, int> Pii;

const ll mod = 1000000007;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  vector<int> a(3);
  for (auto &x: a) cin >> x;

  sort(a.begin(), a.end());

  cout << max(a[2] - a[1], a[1] - a[0]) << endl;

  return 0;
}