#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int A,B,S; cin >> A >> B >> S;

    if(abs(A - S) <= abs(B - S) || S == 1) {
        cout << abs(A - S) + S << endl;
    } else {
        if(A == 0) {
            cout << abs(B - S) + (S - 1) + 2 << endl;
        } else {
            int X = abs(B - S) + (S - 1) + A;
            int Y = abs(B - S) + abs(A - S) + A;
            cout << min(X, Y) << endl;
        }
    }

}