#include <bits/stdc++.h>
using namespace std;
const int N = 100005;
int n, m, k;
int dp[N];
int main() {
cin >> n >> m >> k;
int suma = 0;
for (int i = 0, ai; i < n; i++) {
cin >> ai;
if (ai < k) {
cout << "Impossible";
return 0;
}
suma += ai;
}
int sumb = 0;
dp[0] = 0;
for (int i = 0, bi; i < m; i++) {
cin >> bi;
sumb += bi;
for (int j = 90000; j >= bi; j--) {
dp[j] = max(dp[j], dp[j - bi] + min(bi, n)); // check ediorial!
}
}
for (int i = suma; i <= 90000; i++) {
if (dp[i] < n * k) {
continue;
}
cout << i - suma;
return 0;
}
cout << "Impossible\n";
return 0;
}
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