#!/bin/python3

import os
import sys

#
# Complete the getMoneySpent function below.
#
def getMoneySpent(keyboards, drives, b):
    resultado = -1
    for i in keyboards:
        for j in drives:
            if i+j <= b:
                resultado = max(i+j,resultado)
                
    return resultado


if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    bnm = input().split()

    b = int(bnm[0])

    n = int(bnm[1])

    m = int(bnm[2])

    keyboards = list(map(int, input().rstrip().split()))

    drives = list(map(int, input().rstrip().split()))

    #
    # The maximum amount of money she can spend on a keyboard and USB drive, or -1 if she can't purchase both items
    #

    moneySpent = getMoneySpent(keyboards, drives, b)

    fptr.write(str(moneySpent) + '\n')

    fptr.close()

def getMoneySpent(keyboards, drives, b):
    #
    # Write your code here.
    #
    resultado = -1
    for i in keyboards:
        for j in drives:
            if i+j <= b:
                resultado = max(i+j,resultado)
                
    return resultado

def getMoneySpent(keyboards, drives, b):
    keyboards.sort(reverse=True)
    drives.sort()
    spent_money = -1
    
    i = 0
    j = 0
    
    while i < len(keyboards) and j < len(drives):
        total_arr = keyboards[i] + drives[j]
        if (total_arr > b):
            i = i + 1
        else:
            spent_money = max(spent_money,total_arr)
            j = j + 1
    return spent_money

def getMoneySpent(keyboards, drives, b):
    possible = -1
    for i in keyboards:
        for j in drives:
            if i+j <= b:
                possible = max(possible, i+j)
    return possible