#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <iomanip>
using namespace std;
int main(void){
	long long a;
	cin>>a;
	int count;
	int i;
	for(i=2;i<=a;i++){
		a = floor(a/2);
		if(a==1){
			count = i;
			break;
		}
	}
	cout<<count<<endl;
    return 0;
}