#include <iostream>

using namespace std;

int main(){
int a; //ile zestawow testowych
cin>>a;
int t[a];
for(int i = 0; i < a; i++){
int c,b,d;
cin>>c>>b;
for(int j = 0; j < c; j++){
int h;
cin>>h;
d += 86400/h;}
double ile = d/b;
ile = ceil(ile);
t[i] = (int)ile;}
for(int i = 0; i < a; i++)
cout << t[i] << "\n";
return 0;}