#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    vector<ll> a(3), b;
    for (int i = 0; i < 3; ++i) {
        cin >> a[i];
    }
    b = a;
    sort(b.begin(), b.end());

    ll ans = 1e15;
    if (b[0] == a[1]) {
        ans = min(ans, b[1] - b[0]);
    }

    if (b[2] == a[1]) {
        ans = min(ans, b[2] - b[1]);
    }
    cout << ans << endl;
    return 0;
}