#include <bits/stdc++.h>
using namespace std;
int main(){
int n,m,k,conta=0,contb=0; cin>>n>>m>>k;
if(m<k){
cout<<"impossible"<<"\n";
return 0;
}
vector<int> a(n),b(m);
for(int i=0;i<n;i++){
cin>>a[i];
conta+=a[i];
}
for(int i=0;i<m;i++){
cin>>b[i];
contb+=b[i];
}
if(contb-conta<0){
cout<<"impossible"<<"\n";
return 0;
}
cout<<contb-conta<<"\n";
}
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