#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
#define dunk(a) cout << (a) << endl
using namespace std;
typedef long long ll;

signed int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int a, b, s;
	cin >> a >> b >> s;
	int ans = 100000, res;

	if (abs(a - s) <= abs(b - s) || s == 1) {
		ans = abs(a - s) + s;
	}
	else {
		res = abs(b - s) + abs(s - 1) + abs(a - 1) + abs(1);
		ans = min(ans, res);
		if (a != 0) {
			res = abs(b - s) + abs(s - a) + abs(a - a) + abs(a);
			ans = min(ans, res);
		}
	}

	dunk(ans);

	return 0;
}