Bubble Sort

#include<bits/stdc++.h>

using namespace std;

int main()
{
    long long n,i,test,tc;

    scanf("%lld",&test);

    for(tc=1;tc<=test;tc++)
    {
        scanf("%lld",&n);

        i = n*(n-1);

        if(i%4)
        {
            printf("Case %lld: %lld/2\n",tc,i/2);
        }
        else
        {
            printf("Case %lld: %lld\n",tc,i/4);
        }
    }

    return 0;
}