#include <iostream>
using namespace std;
int liczba_testow, ciast_w_pud, pudelka, suma = 0, obzartuchy, czas[100000];
int main()
{
cin>>liczba_testow;
for (int i=1; i<=liczba_testow; i++)
{
pudelka =0;
cin>>obzartuchy>>ciast_w_pud;
for (int i=0; i<obzartuchy; i++)
{
cin>>czas[i];
suma += 24*3600/czas[i];
}
while (pudelka*ciast_w_pud<suma)
{
pudelka++;
}
cout<<pudelka<<endl;
}
return 0;
}
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