#include <cstdio>
#include <cmath>
using namespace std;
int main()
{
	unsigned n;
	scanf("%ud", &n);
	double p = (double) n;
	int ans;
	double l = log2(p);
	if(trunc(l) == l) printf("%d", (int) trunc(l));
	else	printf("%d\n", (int) (trunc(l)+1));
	return 0;
}