#include<iostream>
#include<vector>
#include<string>
using namespace std;

int main()
{
    int N;
    int current = 1;
    int cnt = 0;

    cin >> N;
    while(true){
        if(current*2 < N){
            current += current;
            cnt++;
        }else break;
    }
    cout << cnt + 1 << endl;

    return 0;
}