//============================================================================
// Name        : mmmmmmmm.cpp
// Author      : sameh mohamed
// Copyright   : don't try i'm warnning you......
// Description : Hello World
//============================================================================
//Egypt came then History
//Pharoas were coders but using different compilers{}{}{}{}{}}}}{{{{@#$%^^&&$$$###()()(***)))([][][][][]]][
#include<bits/stdc++.h>
#include <iostream>
#include<string>
#include<algorithm>
#include<set>
#include<vector>
#include<map>
#include<cmath>
using namespace std;
int b[1005]={0};
int main()
{
int n,m;
cin>>n>>m;
vector<int>a;
for(int i=0;i<n;i++)
{
	int v;
	cin>>v;
	if(b[v]==0)
	a.push_back(v);
	b[v]++;
}
int c=0;
while(m--)
{
	int v;
	cin>>v;
	if(v>=a.back()&&b[v]==0)
		{a.push_back(v);
	b[v]++;}

	else
	{
		for(int i=0;i<(int)a.size();i++)
		{
			if(a[i]>v)
			{
				c+=a.size()-i;
				if(b[v]==0)
				{a.push_back(v);
				sort(a.begin(),a.end());}
				break;
			}
		}
	}

}
cout<<c;

	return 0;
}