#include <bits/stdc++.h>
using namespace std;

int main() {
    int a,b,c;
    cin >> a >> b >> c;
    if(abs(a-c) <= abs(max(a,c)-b)){
        cout << abs(a-c) << endl;
    }
    else{
        cout << abs(max(a,c)-b) << endl;
    }
}