def main():
    N = int(input())
    a = input()
    if " " in a:
        print('assert"')
    else:
        b, c = int(input()), int(input())
        a = int(a)
        myList = {a + b, b + c, c + a}
        myList.remove(max(myList))
        print(max(myList))

if __name__ == "__main__":
    main()