from collections import Counter
N=int(input())
A=list(map(int,input().split()))
ans=N*(N+1)//2
for i in range(1,30):
	cum=[0]*(N+1)
	for j in range(N):
		cum[j+1]=cum[j]+(A[j]-i)
	cnt=Counter({0:1})
	cnt2=Counter({0:1})
	for j in range(N):
		if cum[j]!=cum[j+1]:
			cnt[cum[j+1]]+=1
		cnt2[cum[j+1]]+=1
	for c in cnt:
		ans-=(cnt2[c]*(cnt2[c]-1)//2-cnt[c]*(cnt[c]-1)//2)
print(1+ans)