N = int(input())
A = [int(i) for i in input().split()]

sum = 0

for i in range(N):
	for j in range(i+1,N):
		if A[i] != 1 and A[j] != 1:
			sum += 1
		elif A[i] != 2 and A[j] != 2:
			sum += 2
		else:
			sum += 3
print(sum)