代码如下:

#include<bits/stdc++.h>
#define int unsigned long long
using namespace std;
signed a[300005],b[300005];
signed main()
{
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n,m,sum=0;
	cin>>m>>n;
	for(int i=1;i<=m;i++)cin>>a[i];
	for(int i=1;i<=n;i++)cin>>b[i];
	sort(a+1,a+m+1);
	sort(b+1,b+n+1);
	int now=1;
	for(int i=1;i<=n;i++)
	{
		while(a[now]==0)now++;
		if(b[i]>a[now])now++,b[i]=0;
	}
	if(now<=m)
	{
		cout<<0;
		return 0;
	}
	for(int i=1;i<=n;i++)sum+=b[i]; 
	cout<<sum;
	return 0;
}