#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ll n,m,k,s=0;
cin>>n>>m>>k;
vector<ll> V;
for(ll i=0;i<n;i++){
ll a;
cin>>a;
s+=a;
}
for(ll i=0;i<m;i++){
ll a;
cin>>a;
V.push_back(a);
}
vector<ll> L(1000,0);
L[0]=1;
for(auto x:V){
for(ll i=999;i>=0;i--){
if(L[i]==1){
if(i+x<1000){
L[i+x]=1;
}
}
}
}
ll ans=-1;
for(ll i=s;i<1000;i++){
if(L[i]==1){
ans=i-s;
break;
}
}
if(ans==-1){
cout<<"impossible";
}else{
cout<<ans;
}
}
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