#include <iostream>
using namespace std;

int a, b, c;
cin >> a >> b >> c;

switch (a, b, c) {
    case a > b > c:
        d = a - c;
        cout << d;
        break;
    case b > a > c:
        d = b - c;
        cout << d;
        break;
    case c > b > a:
        d = c - a;
        cout << d;
        break;
    default:
        cout << "mistake";
    return 0;
}