#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
using ll = long long;
ll n,m,i,a[200007],r,res,j,b[200007];
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[i];
    sort(a+1,a+1+n+m-1);
    sort(b+1,b+1+n+m-1);
    for (i=1;i<=m;i++) res+=a[i];
    for (i=1;i<=m;i++) res+=b[i];
    cout<<res+(n-1)/2;
    return 0;
}
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