vector<int> b = {50, 100 , 500, 1000, 5000};
vector<int> F(K + 1, 1000000000);
F[0] = 0;
for(int i = 1; i < K + 1; ++i)
{
    for(int j = 0; j < b.size(); ++j)
    {
        if(i - b[j] >= 0 && F[i - b[j] < F[i])
        {
            F[i] = F[i - b[j]]
        }
    }
    F[i]++;
}
cout << F[K];