#include <stdio.h>

int main(void)
{
	int n, i = 0, biscuit = 1;
	scanf("%d", &n);

	while (n >= biscuit*2) {
		biscuit = biscuit * 2;
		i++;
	}
	if (n == biscuit) {
		printf("%d\n", i);
		return 0;
	} else {
		i++;
	}

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