#include <bits/stdc++.h>
using namespace std;
int main()
{
double N,n;
int c=1;
//long int n;
while(cin>>N and N!=0)
{
n=ceil((sqrt(8*N + 9)+ 3)/2);
printf("Case %d: %.lf\n",c++,n);
}
return 0;
}
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