#include<bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
int r , n , kase = 0;
while(cin >> r >> n &&r &&n){
bool flg = false;
for (int i = 1; i <= 27; ++i)
{
if(i*n >= r){
cout << "Case "<<++kase<<": "<<i-1<<'\n';
flg = true;
break;
}
}
if(!flg)cout << "Case "<<++kase<<": impossible\n";
}
return 0;
}
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
int r , n , kase = 0;
while(cin >> r >> n &&r &&n){
bool flg = false;
for (int i = 1; i <= 27; ++i)
{
if(i*n >= r){
cout << "Case "<<++kase<<": "<<i-1<<'\n';
flg = true;
break;
}
}
if(!flg)cout << "Case "<<++kase<<": impossible\n";
}
return 0;
}
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