import itertools
N = int(input())
A = list(map(int, input().split()))
TF = []
for i in range(N):
    TF.append(A[i]!=0)
gr = itertools.groupby(TF)
ans = N+N*(N-1)//2
for key, group in gr:
    le = len(list(group))
    ans -= key*(le+le*(le-1)//2)
print(ans)