#include <iostream>
#include <math.h>
 
using namespace std;
 
int main() {
    int ile_testow, N = 0, M, c, suma = 0, p; // ile - l. testow, N - l. obzartuchow, M - ilosc ciastek w pudelku, p - l. pudelek z ciastkami, c - ilosc ciastek, suma - suma ciastek
 
    cin >> ile_testow; // wprowadzamy ilosc testow
    for (int i = 1; i <= ile_testow; i++)
    {
        cin >>N>>M ; // wprowadzamy ilosc obzaruchow, ilosc ciastek w paczce
        int t[N];
 
        for (int j = 0; j < N; j++)
        {
            cin >> t[j] ;
            c = floor((86400 / t[j]));
            suma += c;
        }
 
        p = ceil(suma/M);
        cout << p << endl;
    }
    return 0;
}
 

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MgoyIDEwCjM2MDAKMTgwMAozIDM1NgoxMjMKMzI5OTkKMTAxMDE=

2
2 10
3600
1800
3 356
123
32999
10101