#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

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

	cin >> a >> b >> s;

	int ans;

	if (s == 1 || abs(a - s) <= abs(b - s)) {
		ans = abs(a - s) + s;
	} else {
		ans = abs(b - s);
		if (a == 0) {
			ans += s - 1 + 2;
		} else {
			ans += min(abs(s - a) + a, s - 1 + a - 1 + 1);
		}
	}
	cout << ans << endl;
	return 0;
}