#include<iostream>
#include<cmath>
#include<algorithm>

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 if (A != 0) cout << abs(B - S) + min(abs(A - S) + +A, abs(S - 1) + abs(A - 1) + 1) << endl;
	else cout << abs(B - S) + abs(S - 1) + abs(A - 1) + 1 << endl;
}