n = int(input())
a_i = list(map(int,input().split()))
if len(a_i)!=1:
    print('"assert"')
    exit()
array = [int(input()) for i in range(n-1)]
a_i=a_i+array
a_i = sorted(a_i)[::-1]
a_max = a_i[0]+a_i[1]
for i in range(0,len(a_i)-1):
    for j in range(i+1,len(a_i)):
        if a_max>a_i[i]+a_i[j]:
            print(a_i[i]+a_i[j])
            break
    else:
        continue
    break