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

#define ll long long
#define cpy(a,b) copy(begin(a),end(a),begin(b))
#define ld long double
#define dot(x) fixed<<setprecision(x)
#define foru(a,b,c) for(ll a=b;a<=c;a++)

ll n,m,a[10005],b[10005],sum;

int main(){
    freopen("chocolate.in" ,"r",stdin );
    freopen("chocolate.out","w",stdout);
    ios::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    cin>>n>>m;
    foru(i,1,n-1){
        cin>>a[i];
        sum+=a[i];
    }
    foru(i,1,m-1){
        cin>>b[i];
        sum+=b[i];
    }
    foru(i,1,n-1){
        foru(j,1,m-1){
            sum+=min(a[i],b[j]);
        }
    }
    cout<<sum;
    return 0;
}