#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
using ll = long long;
ll n,m,i,a[200007],r,res,j,b;
int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n>>m;
for (i=1;i<=n+m-1;i++) cin>>a[i];
for (i=1;i<=n+m-1;i++) cin>>b;
for (i=1;i<=n;i++) {
for (j=1;j<=m;j++) {
res+=a[m-j];
}
}
cout<<res;
return 0;
}
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