N,K=map(int,input().split())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
C=list(map(int,input().split()))
dat=[]
for i in range(N):
    dat.append((C[i]-B[i],A[i]+C[i],A[i]+B[i]))
dat.sort()
ans=0
for i in range(N):
    if i<K:
        ans+=dat[i][2]
    else:
        ans+=dat[i][1]
print(ans)