#include <iostream>

using namespace std;

int main(){
    int N;
    cin>>N;
    int count = 0;
    int num = 1;
    int goal = N/2 + N%2;
    while (true){
        if(num >=goal) break;
        num*=2;
        count++;
    }
    if (num < N){
        count++;
    }
    cout<<count<<endl;
}