def beautifulTriplets(d, arr):
    beautiful = 0
    for i in range(len(arr) - 2):
        for j in range(i + 1, len(arr) - 1):
            if arr[j] - arr[i] == d:
                for k in range(j + 1, len(arr)):
                    if arr[k] - arr[j] == d:
                        beautiful += 1
    return beautiful