#include <bits/stdc++.h>
using namespace std;
void setup()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
int n, m, k, a, sum, f[300 * 300 + 1];
int main()
{
setup();
cin >> n >> m >> k;
for (int i = 0; i < n; ++i)
{
cin >> a;
sum += a;
if (a < k)
{
cout << "Impossible";
return 0;
}
}
while (m--)
{
cin >> a;
for (int i = 300 * 300; i >= 0; --i)
{
if (a <= i && (a == i || f[i - a] > 0))
{
f[i] = max(f[i], f[i - a] + min(n, a));
}
}
}
for (int i = sum; i <= 300 * 300; ++i)
{
if (f[i] >= n * k)
{
cout << i - sum;
return 0;
}
}
cout << "Impossible";
return 0;
}
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