#include <stdio.h>

int main(void)
{
	int num;
	int cookie;
	int i;
	
	scanf("%d", &num);
	
	cookie = 1;
	i = 0;
	
	while (cookie < num) {
		cookie *= 2;
		i++;
	}
	
	printf("%d\n", i);
	
	return 0;
}