#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 cout << min(abs(A - B) + abs(A - S) + S, B - 1 + A - 1 + 1) << endl;
}