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

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