#include <iostream>
#include <math.h>
using namespace std;
int ile, tab[10000], t=24*60*60, N, M;
float pud=0, k=0;
int main()
{
cin>>ile;
for (int i=1; i<=ile; i++)
{
cin>>N>>M;
for (int j=0; j<N; j++)
{
cin>>tab[j];
k+=t/tab[j];
pud=k/M;
}
cout<<ceil(pud)<<endl;
k=0;
}
return 0;
}
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