#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n,m,k;
cin>>n>>m>>k;
int a[n+1];
int suma=0;
for(int i=1;i<=n;i++)
{
cin>>a[i];
suma+=a[i];
if(a[i]<k)
{
cout<<"Impossible";
return 0;
}
}
int sumb=0;
int b[m+1];
for(int i=1;i<=m;i++)
{
cin>>b[i];
sumb+=b[i];
}
int dp[m+1][sumb+1];
int ans=LLONG_MAX;
memset(dp,0,sizeof dp);
for(int i=1;i<=m;i++)
{
for(int j=sumb;j>=0;j--)
{
dp[i][j]=dp[i-1][j];
if(j>=b[i])
{
dp[i][j]=max(dp[i][j],dp[i-1][j-b[i]]+min(n,b[i]));
}
if(j>=suma&&dp[i][j]>=n*k)
ans=min(ans,j-suma);
}
}
if(ans==LLONG_MAX)
cout<<"Impossible";
else
cout<<ans;
}
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