mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    A = list(map(int, input().split()))
    if len(A) != 1:
        print("\"assert\"")
        exit()
    a = A[0]
    b = int(input())
    c = int(input())
    V = {a+b, b+c, c+a}
    V = sorted(list(V), reverse=True)
    print(V[1])


if __name__ == '__main__':
    main()