#include <bits/stdc++.h>
using namespace std;
int main(){
    int A,B,S;
    cin >> A >> B >> S;
    if(abs(A-S) <= abs(B-S) || S == 1){
        cout << abs(A-S) + S << endl;
    } else {
        int minv = abs(B-S) + S - 1 + abs(A-1) + 1;
        if(A != 0) minv = min(minv, abs(B-S) + abs(A-S) + A);
        cout << minv << endl;
    }

}