#include <iostream>
using namespace std;

int main() {
    int n, ans = 0;
    bool onemore = false;
    cin >> n;
    for (;n > 1; n >>= 1) {
        ans++;
        if (n % 2 == 1)
            onemore = true;
    }
    if (onemore)
        ans++;
    cout << ans << endl;
    return 0;
}