from sys import stdin
import sys
from functools import reduce
##  input functions for me
def ria(sep = ''):
    if sep == '' :
        return list(map(int, input().split())) 
    else: return list(map(int, input().split(sep)))
def rsa(sep = ''):
    if sep == '' :
        return input().split() 
    else: return input().split(sep)
def ri(): return int(input())
def rd(): return float(input())
def rs(): return input()
##

## main ##

N = ri()
A = []
A.append(ria())
if len(A[0]) != 1 :
    print("\"assert\"")
    sys.exit()

A.append(ria())
A.append(ria())
for i in range(0,3): A[i] = A[i][0]
B = set()
for i in range(0,3):
    for j in range(i + 1, 3):
        B.add(A[i] + A[j])
C = list(B)
C.sort()
print(C[len(C) - 2])