#include <iostream>

int main() {
    int N;
    int cookie = 1;
    int spanking = 0;
    
    std::cin >> N;
    
    while (cookie < N) {
        if (cookie*2 <= N) {
            cookie *= 2;
            spanking += 1;
        } else {
            for (int i=cookie; i>0; i--) {
                if (i*2 <= N) {
                    cookie += i;
                    spanking += 1;
                    break;
                }
            }
        }
    }
    
    std::cout << spanking << std::endl;

	return 0;
}