N = int(input())
a = [int(i) for i in input().split()]
if a.__len__() > 2:
    print("\"assert\"")
else:
    for i in range(2):
        a.append(int(input()))
    b = [sum(a)-p for p in a]
    b.sort(reverse=True)
    if b[0] > b[1]:
        print(b[1])
    else:
        print(b[2])