n = int(input())

a = list(map(int, input().split()))
cnt = 0
b = 0
c = [0]
for i in range(n):
    b += a[i]
    c.append(b)

c.sort()
i=0
ncm=0
m = 1
while True:
    i += 1
    if i == n:
        m += 1
        ncm += m*(m-1)//2
        break        
    if c[i] == c[i-1]:
        m += 1
        continue
    else:
        ncm += m*(m-1)//2
        m = 1

print(ncm)