#include <iostream>

int main()
{
    int ret = 0;
    int n;
    std::cin >> n;
    
    while(n > 1)
    {
        if((n % 2) == 1)
            n++;
        
        else
            n /= 2;
            
        ret++;
    }
    
    std::cout << ret << std::endl;
    
    return 0;
}