#import sys
#input = sys.stdin.readline
def main():
    N = int( input())
    A = list( map( int, input().split()))
    if len(A) == 3:
        print('"assert"')
        return
    a = A[0]
    b = int( input())
    c = int( input())
    B = [a+b, b+c, c+a]
    B = list( set(B))
    B.sort(reverse = True)
    
    print(B[1])
if __name__ == '__main__':
    main()