class BIT:
    def __init__(self, n):
        self.n = n
        self.bit = [0]*(self.n+1) # 1-indexed

    def init(self, init_val):
        for i, v in enumerate(init_val):
            self.add(i, v)

    def add(self, i, x):
        # i: 0-indexed
        i += 1 # to 1-indexed
        while i <= self.n:
            self.bit[i] += x
            i += (i & -i)

    def sum(self, i, j):
        # return sum of [i, j)
        # i, j: 0-indexed
        return self._sum(j) - self._sum(i)

    def _sum(self, i):
        # return sum of [0, i)
        # i: 0-indexed
        res = 0
        while i > 0:
            res += self.bit[i]
            i -= i & (-i)
        return res

    def lower_bound(self, x):
        s = 0
        pos = 0
        depth = self.n.bit_length()
        v = 1 << depth
        for i in range(depth, -1, -1):
            k = pos + v
            if k <= self.n and s + self.bit[k] < x:
                    s += self.bit[k]
                    pos += v
            v >>= 1
        return pos

    def __str__(self): # for debug
        arr = [self.sum(i,i+1) for i in range(self.n)]
        return str(arr)

import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

def main():

    n = int(input())
    A = list(map(int, input().split()))

    SA = set(A)
    SA = sorted(list(A))
    atoi = {}
    for i, a in enumerate(SA):
        atoi[a] = i

    N = 2*10**5+50

    j = 0
    bit = BIT(N+1)
    from collections import defaultdict
    ans = 0
    for i in range(n):
        while j < n:
            if i == j:
                bit.add(atoi[A[j]], 1)
                j += 1
            else:
                bit.add(atoi[A[j]], 1)
                M = SA[bit.lower_bound(j-i+1)]
                m1 = SA[bit.lower_bound(1)]
                m2 = SA[bit.lower_bound(2)]
                if M <= m1+m2:
                    j += 1
                else:
                    bit.add(atoi[A[j]], -1)
                    break
        ans += j-i-1
        if i == j:
            j += 1
        else:
            bit.add(atoi[A[i]], -1)
    print(ans)

if __name__ == '__main__':
    main()