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

int main(){
    int N, cnt = 1, i = 0;

    cin >> N;
    while(cnt <= N){
        cnt *= 2;
        i++;
    }
    i--;
    cnt /= 2;
    if(N == cnt){

    }else if((N - cnt)%2 == 0){
        i++;
    }else{
        i++;
    }

    cout << i << endl;

    return 0;
}