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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int a,b,s; cin >> a >> b >> s;
    if(abs(a-s) <= abs(b-s)) cout << abs(a-s)+s << endl;
    else if(s == 1) cout << abs(a-s)+s << endl;
    else if(a == 0) cout << abs(b-s)+s-1+abs(a-1)+1 << endl;
    else cout << abs(b-s)+min(s-1+abs(a-1)+1,abs(s-a)+a) << endl; 
}