import math
import sys


def input():
    return sys.stdin.readline().strip()


def main():
    n,k=map(int,input().split())
    *a,=map(int,input().split())
    *b,=map(int,input().split())
    *c,=map(int,input().split())
    
    ans = sum(a)+sum(c)
    z = sorted(x-y for x,y in zip(b,c))
    ans += sum(z[n-k:])
    print(ans)
    


if __name__ == "__main__":
    main()