#include<stdio.h>
#include<math.h>

int main(void){
	int n,ans=0,max=1;

	scanf("%d",&n);
	while(n>max*2) max *= 2;

	if((n-max)%2 == 0) ans = log2(max) + 1;
	else if(n-max == 1) ans = log2(max) + 1;
	else ans = log2(max) + 2;

	printf("%d\n",ans);

	return 0;
}