# 1470 Mex Sum

from sys import stdin

def mex(i,j):
    if i+j>=4:
        if i==1 or j==1:
            return 2
        return 1
    return i+j

n=int(stdin.readline())
a=list(map(int,stdin.readline().split()))

sum=0
for i in range(n-1):
    for j in range(i+1,n):
        sum+=mex(a[i],a[j])

print(sum)