#include <iostream>
#include <cmath>
 
using namespace std;
 
int ile,ile_u,ile_wp; 
int *czas;
 
int ciastka()
{
    double x=0;
 
    for (int i = 0; i < ile_u; i++)
    {
        x+=86400/czas[i];
    }
 
    x/=ile_wp;
 
    return ceil(x);
}
 
int main()
{
    cin>>ile;
 
    for(int i=0; i<ile; i++)
    {
        cin>>ile_u>>ile_wp;
 
        czas = new int [ile];
 
        for (int i=0; i<ile_u; i++)
        {
            cin>>czas[i];
        }
        cout<<ciastka()<<endl;  
    }
 
    return 0;
}

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