#include <iostream>
#include <algorithm>
#include <string>

using namespace std;

int main()
{
    int N, cnt = 0, num = 1;
    cin >> N;

    
    while(num * 2 < N)
    {
        num *= 2;
        cnt++;
    }

    cout << (N == 1 ? 0 : cnt + 1) << endl;
    return 0;
}