from collections import defaultdict

from itertools import accumulate
N = int(input())
A = list(map(int, input().split()))


def helper(A):
   N = len(A)
   W = list(accumulate(A, initial=0))
   dp = [0]*(30+1)
   for x in range(1, 31):
      d = defaultdict(int)
      term = 0
      for i in range(N):
         t = W[i+1] - (i+1) * x
         if A[i] == x:
            term += d[t]
         s = W[i] - i*x
         d[s] += 1
      dp[x] += term
   return sum(dp)


def resolve(A):
   N = len(A)
   W = list(accumulate(A, initial=0))
   dp = [0]*(30+1)
   for x in range(1, 31):
      d = defaultdict(int)
      term = 0
      for i in range(N):
         if A[i] != x: continue
         t = W[i+1] - (i+1) * x
         term += d[t]
         s = W[i] - i*x
         d[s] += 1
      dp[x] += term
   return sum(dp)


ans = N*(N-1) // 2
ans -= helper(A)
ans -= helper(A[::-1])
ans += resolve(A)
print(ans+1)