#include <iostream>
#include <algorithm>
#include <cmath>

using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    int ans = 1000000000;
    ans = min(ans, abs(a-b));
    ans = min(ans, abs(b-c));
    ans = min(ans, abs(a-c));
    cout << ans << endl;
}