#include<iostream>
#include<cstdlib>
#include<vector>
#include<algorithm>

using namespace std;

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

    vector<int> d = {abs(a-b), abs(b-c), abs(c-a)};

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

    cout << d.at(0) << endl;
}