#include <iostream>
#include <cstdlib>
#include <algorithm>

using namespace std;

int main() {
	int a, b, s;
	cin >> a >> b >> s;
	int movement = 0;
	if (s > 1 && abs(a - s) > abs(b - s)) {
		movement += abs(b - s);
		int movement1, movement2;
		int transit = max(1, a);
		movement1 = movement + abs(s - transit);
		movement1 += abs(a - transit) + transit;
		transit = 1;
		movement2 = movement + abs(s - transit);
		movement2 += abs(a - transit) + transit;
		movement = min(movement1, movement2);
	} else {
		movement += abs(a - s) + s;
	}
	cout << movement << endl;
	return 0;
}