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

Pos = [0 for _ in range(n + 1)]
for i in range(n):
    Pos[P[i]] = i + 1

ans = 0
s = n * (n + 1) // 2
for i in range(n, 0, -1):
    tmp = s - 2 * Pos[i]
    ans = max(ans, tmp)
    s -= Pos[i]
print(ans)