// User function Template for C++

class Solution{

    int Sequence(int length, int start, int end)

    {

        if (length == 0) return 1;

        if (start > end) return 0;

        auto result = 0;

        for (int i = start; i <= end; i++)

        {

            result += Sequence(length - 1, i*2, end);

        }

        return result;

    }

public:

    int numberSequence(int m, int n)

    {

        auto ret = Sequence(n, 1, m);

        return ret;

    }

};