#include <iostream>

int NextPoworOfTwo(unsigned int val)
{
    unsigned int mask = 0x80000000;    
    if(val & mask)
        return 0;
    
    
    val <<= 1;

    while(!(val & mask))
    {
        mask >>= 1;
    }
    
    return mask;
}

int BitCount(unsigned int val)
{
    int count = 0;
    while(val)
    {
        count += val & 1;
        val >>= 1;
    }
    
    return count;
}

int main()
{
    int ret;
    int n;
    std::cin >> n;
    
    int n2 = (BitCount(n) == 1)? n:NextPoworOfTwo(n);
    ret = n2 - n;
    
    while(n2 > 1)
    {
        n2 /= 2;
        ret++;
    }
    
    std::cout << ret << std::endl;
    
    return 0;
}