e=int(input())
n=int(input())
r=[0]*n
a=list(map(int,input().split()))
b=list(map(int,input().split()))
for i in range(n):
    r[i]=[a[i],0]
for i in range(n):
    r[i][1]=b[i]
r.sort(key=lambda x: x[1])
r=r[::-1]
d=[0]*n
for i in range(n):
    flag=False
    for j in range(1,len(d[0:r[i][0]])+1):
        if d[r[i][0]-j]==0:
            flag=True
            d[r[i][0]-j]=-1
            break
    if flag:
        r[i][0]=-1
for i in range(n):
    if r[i][0]!=-1:
        e-=r[i][1]
print(e)