#include <iostream>
using namespace std;

int count(int N, int biscuit_count, int tap_count) {
    return biscuit_count < N ? count(N, biscuit_count * 2, tap_count + 1) : tap_count;
}

int main() {
    int N;
    cin >> N;
    cout << count(N, 1, 0) << endl;
}