#include<bits/stdc++.h>
#define ll long long
#define N 10001
using namespace std;
ll n,m,x[N],y[N],ans;
inline ll read(){
	ll x=0,f=1;
	char c=getchar();
	while(c<'0'||c>'9'){
		if(c=='-') f=-1;
		c=getchar();
	}
	while(c>='0'&&c<='9'){
		x=x*10+(c-'0');
		c=getchar();
	}
	return x*f;
}
inline void write(ll x){
	char c[101];
	ll cnt=0;
	while(x>0){
		c[++cnt]=x%10+'0';
		x/=10;
	}
	while(cnt) putchar(c[cnt--]);
	putchar('\n');
	return ;
}
int main(){
	freopen("chocolate.in","r",stdin);
	freopen("chocolate.out","w",stdout);
	n=read();
	m=read();
	for(int i=1;i<n;i++){
		x[i]=read();
		ans+=x[i];
	}
	for(int i=1;i<m;i++){
		y[i]=read();
		ans+=y[i];
	}
	for(int i=1;i<n;i++)
	for(int j=1;j<m;j++) ans+=min(x[i],y[j]);
	write(ans);
	return 0;
}