#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int ans = 0;
	while (n > 1)
	{
		ans++;
		if (n % 2 > 0)
			n++;
		else
			n /= 2;
	}
	printf("%d\n", ans);
	return 0;
}