#include <iostream>
#include <cstring>
#include <cmath>

using namespace std;

int main()
{
	int A, B, S;
	cin >> A >> B >> S;

	if (S == 1)
		cout << abs(A - 1) + 1;
	else if (abs(A - S) <= abs(B - S))
		cout << abs(A - S) + S;
	else
		cout << abs(B - S) + S + A-1;

	return 0;
}