#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

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

    int ans = min({abs(a - b), abs(b - c), abs(c - a)});

    cout << ans << endl;

    return 0;
}