// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;
#define int long long
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

signed main() {
    int n,m;cin>>n>>m;
    vector<int> v(n-1),f(m-1);
    for(int i = 0;i<n-1;i++){
        cin>>v[i];
    }
    for(int i = 0;i<m-1;i++){
        cin>>f[i];
    }
    vector<pair<int,int>> ossz;
    int vv=0,vf=0,cost=0;
    for(int i = 0;i<n+m-2;i++){
        if(i<n-1)ossz.push_back({v[i],0});
        else ossz.push_back({f[i-n+1],1});
    }
    sort(ossz.rbegin(),ossz.rend());
    for(int i = 0;i<ossz.size();i++){
        cost+=ossz[i].first*(1+(ossz[i].second==0?vf+(++vv)*0LL:vv+(++vf)*0LL));
    }cout<<cost<<endl;
}