#include<bits/stdc++.h>
#include<math.h>
using namespace std;
double a[1000008];
int main()
{
    long long int n,b,t,i,c,j,k,d,e;
    a[0]=0;
    for(i=1;i<=1000005;i++){
        a[i]=a[i-1]+log(i);
       // cout<<a[i]<<endl;
    }
    cin>>t;
    for(k=1;k<=t;k++)
    {
        cin>>n>>b;
        c=(a[n]/log(b))+1;
        printf("Case %lld: %lld\n",k,c);
    }
    return 0;
}