n = int(input())

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

if len(A) == 3:
    print('"assert"')
else:
    a = A[0]
    b = int(input())
    c = int(input())
    t = [a+b, b+c, c+a]
    s = list(set(t))
    s.sort(reverse=True)
    print(s[1])