#Сы Юйхао, 1032255367,НКАбд-04-25,7.3.26, 16:26
#Дан массив. Найти два элемента, сумма которых максимальна
def sum_max(arr):
    n = len(arr)
    if n < 2:
        return None
    max1 = float("-inf")
    max2 = float("-inf")
    pos1 = -1
    pos2 = -1
 
    for i in range(n):
        if arr[i] > max1:
            max2 = max1
            pos2 = pos1
            max1 = arr[i]
            pos1 = i
        elif arr[i] > max2:
            max2 = arr[i]
            pos2 = i
    return max1 + max2, pos1, pos2
n = int(input())
arr = list(map(int,input().split()))
result = sum_max(arr)
if result:
    sum_1, pos1, pos2 = result
    print(sum_1)
else:
    print("Ошибка")

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