from collections import Counter
MOD = 10 ** 9 + 7
N = int(input())
A = list(map(int, input().split()))
C = Counter(A)
NC = len(C)
dp = [1, 0, 0, 0]
for v in C.values():
    dp2 = [1, 0, 0, 0]
    for i in range(3):
        dp2[i + 1] = dp[i + 1] + v * dp[i]
        dp2[i + 1] %= MOD
    dp = dp2
print(dp[3])