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#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
int n, T, m, k,sum;
int a[100];
cin >> n;   
for (int i = 0; i < n; i++)
{
cin >> T >> m >> k;
sum = 0;
for (int j = 0; j < k; j++)
{
cin >> a[j];
}
sort(a,a + k);
for (int j = 0; j < m; j++)
{
sum += a[j];
if (sum > T)
break;
}
if (sum > T)
{
cout << "Impossible" << endl;
}
else
{
cout << sum << endl;
}
}
return 0;
}