public static int birthday(List<int> s, int d, int m)
    {
        int possibleCombinations = 0;
        for(int i=0; i<s.Count; i++)
        {
            if((s.Count) - i < m) break;

            if(s.GetRange(i, m).Sum(e => e) == d)
            {
                possibleCombinations++;
            }
        }
        
        return possibleCombinations;
    }