#include<iostream> 
#include<cstdio> 
#include<cmath> 
#include<algorithm> 
#include<cstring> 
#include<string> 
using namespace std;
int main(){
	double longg;
	cin >> longg;
	if(longg == 1){
		cout << 1;
		return 0;
	} 
	for(int i=2;longg > 1;i++){
		longg = floor(longg/2);
		if(longg == 1){
			cout << i;
			break;
		}		 	 
	}
	return 0;
}