#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int a, b, c;
    cin >> a >> b >> c;

    cout << min({ abs(a - b), abs(b - c) , abs(c - a) }) << endl;

    return 0;
}