int putere(unsigned int n, unsigned int p)
{
    int div = 2, exp = 0;
    while(n > 1)
    {
        while(n % div == 0)
        {
            exp = exp + 1;
            n = n / div;
        }
        if(exp != 0)
        {
            if(div == p)
                return exp;
        }
        exp = 0;
        div = div + 1;
    }
    return -1;
}