#include <iostream>
using namespace std;
int main()
{
unsigned int ile=0,lo=0,lp=0;
unsigned int c[10000];
unsigned int wynik=0;
cin>>ile;
for (int i=1;i<=ile;i++)
{
cin>>lo>>lp;
for (int i=0;i<=(lo-1);i++)
{
cin>>c[i];
wynik+=(86400/c[i]);
}
wynik/=lp;
if (wynik%lp!=0)
{
wynik++;
}
cout<<wynik<<endl;
}
return 0;
}
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