public static int birthday(List<Integer> s, int d, int m) {
        int count = 0, currentSum=0;
        ArrayList<Integer> candidates = new ArrayList<>();
        // Initial items
        for(int i=0;i < m;i++){
            candidates.add(s.get(i));
            currentSum += s.get(i);
        }
        //Check if satisfies the solution
        if(currentSum == d) count++;
        // m - 1 as I already have the first 3 items
        for(int i=m; i < s.size();i++){
            //Substract candidates[0] from sum
            currentSum -= candidates.remove(0);
            //Enqueue new item
            candidates.add(s.get(i));
            //Add new item to sum
            currentSum += s.get(i);  
            //Check if satisfies the solution
            if(currentSum == d) count++;          
        }
        return count;
        
    }