#include <iostream>
using namespace std;

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

    if (a > b){
        int aux = a;
        a = b;
        b = aux;
    }

    if (a > c){
        int aux = a;
        a = c;
        c = aux;
    }

    if (b > c){
        int aux = b;
        b = c;
        c = aux;
    }
    mm = c - a;
    cout << mm;
    return 0;
}