from collections import defaultdict

n=int(input())
ns=list(map(int,input().split()))
ans=0

for i in range(n):
    dic= defaultdict(int)
    dic[ns[i]] += 1
    if ns[i] == 0:
        ans += n-i
        continue
    for j in range(i,n):
        dic[ns[j]] += 1
        if dic[0] > 0:
            ans+=1

print(ans)