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

if len(a) == 3:
    print('"assert"')
    exit()
    
x = a[0]
y = int(input())
z = int(input())

ans_set = set([])
ans_set.add(x + y)
ans_set.add(y + z)
ans_set.add(z + x)
li = list(ans_set)
li = sorted(li, reverse = True)
print(li[1])