def beautifulTriplets(d, arr):
    ans = 0
    for a in range(len(arr)):
        for b in range(a + 1, len(arr)):
            if arr[b] - arr[a] == d:
                for c in range(b + 1, len(arr)):
                    if arr[c] - arr[b] == d:
                        ans += 1
    return ans