#include <stdio.h>
#include <stdlib.h>
#define min(a, b) a < b ? a : b

int main() {
	int a, b, s;
	scanf("%d %d %d", &a, &b, &s);

	int da = abs(s - a), db = abs(s - b);
	int ans = 0, ans2 = 0;

	if (s == 1) ans = da + 1;
	else if (da <= db) ans = da + s;
	else {
		ans += db + s + abs(1 - a);
		ans2 += db + abs(a - s) + a;
		ans = min(ans, ans2);
	}

	printf("%d\n", ans);
	return 0;
}