#include <iostream>
#include <cmath>
using namespace std;
int ile,ile_u,ile_wp;
int *czas;
int ciastka()
{
double x=0;
for (int i = 0; i < ile_u; i++)
{
x+=86400/czas[i];
}
x/=ile_wp;
return ceil(x);
}
int main()
{
cin>>ile;
for(int i=0; i<ile; i++)
{
cin>>ile_u>>ile_wp;
czas = new int [ile];
for (int i=0; i<ile_u; i++)
{
cin>>czas[i];
}
cout<<ciastka()<<endl;
}
return 0;
}
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