#include <iostream>

void func47()
{
    int target = 0;
    int r = 0;
    int n = 1;

    std::cin >> target;
    while (n < target) {
        r++;
        n = n * 2;
    }

    std::cout << r << std::endl;
}

int main() {
    func47();
    return 0;
}