#include <iostream>

using namespace std;

int main() {
    size_t n; 
    cin >> n;
    size_t num_attacks = 1;
    while(true) {
        for(size_t pattern = 0; pattern < (1 << num_attacks); pattern++) {
            size_t damage = 0;
            for(size_t i = 0; i < num_attacks; i++) {
                if((pattern >> i) % 2 == 0) {
                    damage++;
                }
                else {
                    damage *= 2;
                }
            }
            if (damage >= n) {
                cout << num_attacks << endl;
                return 0;
            }
        }
        num_attacks++;
    }
}