from collections import defaultdict
from itertools import combinations

N = int(input())
take = defaultdict(lambda: 0)
devider = 10**9 + 7

for i in [i for i in input().split()]:
    take[i] += 1

s_1 = sum([v for v in take.values()])
s_2 = sum([v**2 for v in take.values()])
s_3 = sum([v**3 for v in take.values()])
res = (s_1**3 - 3*s_1*s_2 + 2*s_3) // 6

print(res)