#include<bits/stdc++.h>
using namespace std;
#define ll long long

ll n,m;
ll x[11000],y[11000];
ll ans;

int main(){
	freopen("chocolate.in","r",stdin);
	freopen("chocolate.out","w",stdout);
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n>>m;
	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;
	return 0;
}