#include <iostream>
#include <cmath>
 
using namespace std;
 
int main()
{
	int proby;
	cin >> proby;
 
	int *obzartuchy = new int[proby];
	float *w_pudelku = new float[proby];
	float *suma = new float[proby];
 
	for (int i = 0; i < proby; i++)
	{
		suma[i] = 0;
	}
 
	for (int i = 0; i < proby; i++)
	{
		cin >> obzartuchy[i];
		cin >> w_pudelku[i];
		float *czasy = new float[obzartuchy[i]];
		for (int j = 0; j < obzartuchy[i]; j++)
		{
			cin >> czasy[j];
			suma[i] += floor(86400.0 / czasy[j]);
 
		}
		delete[] czasy;
	}
	for (int i = 0; i<proby; i++)
	{
		int liczba = ceil(suma[i] / w_pudelku[i]);
		cout << liczba << endl;
	}
 
	delete[] obzartuchy;
	delete[] w_pudelku;
	delete[] suma;
 
 
	return 0;
}

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MgoyIDEwCjM2MDAKMTgwMAozIDM1NgoxMjMKMzI5OTkKMTAxMDE=

2
2 10
3600
1800
3 356
123
32999
10101