#include <iostream>
#include <math.h>
using namespace std;
int ile_zestawow,N,M,czas;
int main()
{
cin >> ile_zestawow;
for(int i=1; i<=ile_zestawow; i++)
{
float ile_ciastek=0;
cin >> N >> M;
for(int i=1;i<=N;i++)
{
cin >> czas;
ile_ciastek+=(24*60*60)/czas;
}
cout << ceil(ile_ciastek/M) << endl;
}
return 0;
}
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