#include <iostream>
#include <cmath>
using namespace std;
int t;
int main()
{
cin>>t;
for(int i=0; i<t; i++)
{
int n, m;
double doba=86400, c, wynik2=0;
cin>>n>>m;
for (int k=0; k<n; k++)
{
double wynik=0;
cin>>c;
wynik=doba/c/m;
wynik2+=wynik;
}
wynik2=ceil(wynik2);
cout<<wynik2<<endl;
}
return 0;
}
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