This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
void ckmin(int& a, int b){
a = min(a, b);
}
const int MOD = 1e9+7;
const int mx = 305;
int N, M, K;
int Asum = 0;
int A[mx];
int B[mx];
int Bp[mx];
bitset<305*305> dp1;
bitset<305*305> dp[305];
int main(){
cin >> N >> M >> K;
for(int i = 0; i < N; i++){
cin >> A[i];
Asum+=A[i];
}
for(int i = 0; i < M; i++){
cin >> B[i];
}
for(int i = 0; i < N; i++){
if(A[i] < K){
cout << "Impossible" << "\n";
exit(0);
}
}
for(int i = 0; i < M; i++){
Bp[i] = min(B[i], N);
}
// if(M <= 15){
// int ans = MOD;
// for(int i = 0; i < (1<<M); i++){
// int Bsum = 0;
// int Bpsum = 0;
// for(int j = 0; j < M; j++){
// if((i>>j)&1){
// Bsum+=B[j];
// Bpsum+=Bp[j];
// }
// }
// if(Bsum >= Asum && Bpsum >= N*K){
// ckmin(ans, Bsum);
// }
// }
// if(ans == MOD){
// cout << "Impossible" << "\n";
// }
// else{
// cout << ans-Asum << "\n";
// }
// exit(0);
// }
dp1[0] = 1;
for(int i = 0; i < M; i++){
if(B[i] <= N){
dp1|=(dp1<<B[i]);
}
}
for(int i = 0; i < 305*305; i++){
if(dp1[i] == 1){
dp[min(i/N, K)][i] = 1;
}
}
for(int i = 0; i < M; i++){
if(B[i] <= N) continue;
//cout << i << "\n";
for(int j = K+1; j >= 1; j--){
if(j == K+1){
dp[K]|=(dp[K]<<B[i]);
}
else{
dp[j]|=(dp[j-1]<<B[i]);
}
}
// for(int j = 1; j <= K; j++){
// for(int k = 0; k <= 12; k++){
// cout << dp[j][k] << " ";
// }
// cout << "\n";
// }
// cout << "\n";
}
for(int i = Asum; i < 305*305; i++){
if(dp[K][i] == 1){
cout << i-Asum << "\n";
exit(0);
}
}
cout << "Impossible" << "\n";
}
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