//
//  main.cpp
//  abc
//
//  Created by Alex Rancea on 11/02/15.
//  Copyright (c) 2015 Alex Rancea. All rights reserved.
//

#include <iostream>
#include <math.h>
using namespace std;

int main(int argc, const char * argv[]) {
    // insert code here...
    int n,i;
    cin>>n;
    for(i=7;i>=0;i--){
        if(pow(2,i)<=n){
            cout<<i+1;
            break;
        }
    }
    return 0;
}