from collections import defaultdict

N=int(input())
A=list(map(int,input().split()))
def solve(N,A):
    ans=N*(N+1)//2
    for m in range(1,31):
        C=[0]+[a-m for a in A]
        for i in range(1,N+1):
            C[i]+=C[i-1]
        dct=defaultdict(int)
        for i in range(N+1):
            dct[C[i]]+=1
            if i<N and A[i]==m:
                ans-=dct[C[i]]
        dct=defaultdict(int)
        for i in range(N,-1,-1):
            dct[C[i]]+=1
            if i and A[i-1]==m:
                ans-=dct[C[i]]
    C=[0]+A
    for i in range(1,N+1):
        C[i]+=C[i-1]
    dct=defaultdict(list)
    for i in range(N):
        dct[(A[i],C[i]-i*A[i])].append(i)
    for lst in dct.values():
        le=len(lst)
        ans+=le*(le+1)//2
    ans+=1
    return ans
ans=solve(N,A)
print(ans)