n = int(input())
a = [int(i) for i in input().split()]
d = dict()


def mex(x, y):
    a = {x, y}
    i = 1
    while True:
        if i not in a:
            return i
        i += 1


for i in a:
    i = min(i, 3)
    if i in d:
        d[i] += 1
    else:
        d[i] = 1

ans = 0
for x, i in d.items():
    for y, j in d.items():
        ans += i*j*mex(x, y)
for i in a:
    ans -= mex(i, i)
print(ans // 2)