#pragma GCC optimize("Ofast")
#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
//#define int long long
template<typename T> inline bool chmax(T& a,T b) { if (a < b) { a = b; return true; } return false; }
template<typename T> inline bool chmin(T& a,T b) { if (a > b) { a = b; return true; } return false; }

long long mid(long long a, long long b, long long c) {
    return a+b+c-max({a, b, c})-min({a, b, c});
}

int main() {
    long long a, b, c;
    cin >> a >> b >> c;
    if (mid(a, b, c) == b) { cout << 0 << endl; return 0; }
    if (min({a, b, c}) == b) {
        long long d = abs(b-min(a, c)), e = abs(a-c);
        cout << min(d, e) << endl;
    } else {
        long long d = abs(b-max(a, c)), e = abs(a-c);
        cout << min(d, e) << endl;
    }
}