import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################


n, k = na()
a = na()
b = na()
c = na()
d = [b[i]-c[i] for i in range(n)]
d.sort(reverse=True)

ans = sum(a) + sum(c) + sum(d[:k])

print(ans)