#include <iostream>

int main()
{
    int num = 0;
    int sum = 1;
    int N;
    std::cin >> N;
    while(true)
    {
        if(sum >= N)
        {
            std::cout << num << std::endl;
            break;
        }
        num++;
        sum *= 2;
    }
    
    return 0;
}