from atcoder.segtree import SegTree
N = int(input())
A = list(map(int,input().split()))

def op(x,y):
    a = sorted([x[0], y[0], x[1], y[1]])[1]
    return (min(x[0], y[0]), a, max(x[2], y[2]))

e = (10**10, 10**10, 0)

T = SegTree(op, e, [(A[i], 10**18, A[i]) for i in range(N)])
ans = 0
for i in range(N):
    ans += T.max_right(i, lambda x: x[2] <= x[0] + x[1]) - (i + 1)
print(ans)