#include <iostream>
#include <cmath>
 
using namespace std;
 
int main()
{
   {
    int ilep, ileu, n, x;
    cin >> ilep;
    for (int i=1; i<=ilep; i++)
 
        {
            float y =0,ciastka;
            cin >> ileu >> ciastka;
            for (int j=1; j<=ileu; j++)
            {
                cin >>n;
                x=(3600/n)*24;
                y=y+x;
            }
            cout << ceil(y/ciastka) <<endl ;
 
        }
 
    }
return 0;
}
 

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MgoyIDEwCjM2MDAKMTgwMAozIDM1NgoxMjMKMzI5OTkKMTAxMDE=

2
2 10
3600
1800
3 356
123
32999
10101