n = int(input())
A = list(map(int, input().split()))
ans = n*(n+1)//2
X = []
cur = A[0]
cnt = 0
for a in A:
    if a == cur:
        cnt += 1
    else:
        if cur == 1:
            X.append(cnt)
        cur = a
        cnt = 1
else:
    if cur == 1:
        X.append(cnt)

for x in X:
    ans -= x*(x+1)//2
print(ans)