#include <iostream>
using namespace std;
int main()
{
int liczba_ludzi; //10.000
int w_jednym_pudelku; //1.000.000.000
int n, k,i; //do pentli
int sec = 86400;
cin>>n;
for (k = 0; k < n; k++) {
int suma = 0;
cin>>liczba_ludzi;
cin>>w_jednym_pudelku;
int zestaw_czasow[liczba_ludzi];
for (i = 0; i < liczba_ludzi; i++)
cin>>zestaw_czasow[i];
for (i = 0; i < liczba_ludzi; i++) zestaw_czasow[i] = sec / zestaw_czasow[i];
for (i = 0; i < liczba_ludzi; i++) suma = suma + zestaw_czasow[i];
if (suma % w_jednym_pudelku == 0) cout<<suma / w_jednym_pudelku<<endl;
else {
int wynik = suma / w_jednym_pudelku + 1;
cout<<wynik<<endl;
}
}
}
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