#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,i,j,counter,maximum_spanning_tree,edge,test=0;
while(scanf("%d",&n)==1)
{
if(n==0)
{
break;
}
counter=0;
for(i=1;i<=n;i++)
{
for(j=i+1;j<=n;j++)
{
counter++;
}
}
edge=n-1;
maximum_spanning_tree=counter/edge;
printf("Case %d: %d\n",++test,maximum_spanning_tree);
}
return 0;
}
using namespace std;
int main()
{
int n,i,j,counter,maximum_spanning_tree,edge,test=0;
while(scanf("%d",&n)==1)
{
if(n==0)
{
break;
}
counter=0;
for(i=1;i<=n;i++)
{
for(j=i+1;j<=n;j++)
{
counter++;
}
}
edge=n-1;
maximum_spanning_tree=counter/edge;
printf("Case %d: %d\n",++test,maximum_spanning_tree);
}
return 0;
}
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