def beautifulTriplets(d, arr):
    # Write your code here
    list2=[]
    for i in arr:
        list1=[]
        a=i
        for j in arr[1:]:
            if len(list1)<3:
                if j-a==d:
                    if a not in list1:
                        list1.append(a)
                    list1.append(j)
                    a=j
        if len(list1)==3:          
            list2.append(list1)
    # print(list2)    
    return len(list2)