#include<bits/stdc++.h>
using namespace std;
int main()
{
long long int i,j,k,t,n,m,f,a,p;
cin>>t;
for(i=1; i<=t; i++)
{
cin>>n;
f=0;
for(j=1; j<=n; j++)
{
cin>>a;
if(j==1)
{
f+=ceil((a-2)/5.0); // normal nose size=2 so for present state nose is a-2; and count how many lies he told
p=a; // present state
}
else
{
f+=ceil((a-p)/5.0); // false counting
p=a;
}
}
cout<<"Case "<<i<<": "<<f<<endl;
}
return 0;
}
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