#include <iostream>
using namespace std;
int ile,ip2,n;
float ip,m,ip3;
int main() {
// your code goes here
cin>>ile;
for(int i=1; i<=ile; i++)
{
cin>>n>>m;
int suma=0;
float *czas;
czas = new float [n];
for (int i=0; i<n; i++)
{
cin>>czas[i];
}
for (int i=0; i<n; i++)
{
suma+=(86400/czas[i]);
}
ip=suma/m;
ip2=ip;
ip3=ip-ip2;
if (ip3!=0)
{
ip2+=1;
}
cout<<ip2<<endl;
delete []czas;
}
return 0;
}
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