#include <bits/stdc++.h>
using namespace std;

int main(){
	int n;cin >> n;
	vector<int> a(40);
	a.at(0)=1;
	a.at(1)=2;
	for(int i=2;i<40;++i){
		a.at(i)=a.at(i-1)*2;
		if(a.at(i)>n) break;
	}
	for(int i=0;i<40;++i){
		if(a.at(i)==n){
			cout << i << endl;
			break;
		}
		else if(a.at(i)<n && a.at(i+1)>n){
			cout << i+1 << endl;
			break;
		}
	}
}