#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b, s;
	cin >> a >> b >> s;

	if (abs(a - s) <= abs(b - s)) {
		cout << (abs(a - s) + s) << endl;
	} else {
		if (a >= 1) {
			cout << abs(b - s) + a + min(abs(a - s), s - 1) << endl;
		} else {
			cout << abs(b - s) + (s - 1) + 2 << endl;
		}
	}
}