#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N=10010;
const int M=0;
const int MOD=998244353;
const int MAXX=2e9;
int n,m,ans=0;
int x[N],y[N];
int main()
{
	freopen("chocolate.in","r",stdin);
	freopen("chocolate.out","w",stdout);
	 
	cin>>n>>m;
	for(int i=1;i<n;i++) cin>>x[i],ans+=x[i];
	for(int i=1;i<m;i++) cin>>y[i],ans+=y[i];
	for(int i=1;i<n;i++) for(int j=1;j<m;j++) ans+=min(x[i],y[j]);
	cout<<ans<<endl;
	return 0;
}