#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
#include <set>
#include <cstdio>
#include <string>

using namespace std;

int main() {
  vector<int> a(3);
  for (int i = 0; i < 3; i++) {
    cin >> a[i];
  }
  sort(a.begin(), a.end());
  cout << a[2] - a[0] << endl;
  return 0;
}