#include <iostream>
using namespace std;
int x,test,a,n,w,b=0;
long int m;
int main()
{
cin >> test;
for(int h=0; h<test; h++)
{
cin>>n;
cin>>m;
for (int i=0;i<n;i++)
{
cin>>a;
x=86400/a;
b=(b+x);
}
;
w=b%m;
if (w!=0)
{
cout<<b/m+1;
}
else cout<<b/m;
}
return 0;
}
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