/*
Link : http://www.lightoj.com/volume_showproblem.php?problem=1045
*/

#include <bits/stdc++.h>

#define pii pair <int,int>
#define sc scanf
#define pf printf
#define Pi 2*acos(0.0)
#define ms(a,b) memset(a, b, sizeof(a))
#define pb(a) push_back(a)
#define MP make_pair
#define oo 1<<29
#define dd double
#define ll long long
#define EPS 10E-10
#define ff first
#define ss second
#define MAX 10000
#define SZ(a) (int)a.size()
#define getint(a) scanf("%d",&a)
#define loop(i,n) for(int i=0;i<n;i++)
#define all(a) a.begin(),a.end()
#define intlim 2147483648
#define inf 1000000
#define rtintlim 46340
#define llim 9223372036854775808
#define rtllim 3037000499
#define ull unsigned long long
#define I int

using namespace std;

double ara[1000010];

int main()
{
    ///freopen("in.txt","r",stdin);
    ///freopen("out.txt","w",stdout);
    int t,cases=0;
    getint(t);
    for(int i=1;i<=1000005;i++)
        ara[i]=log((double)i)+ara[i-1];
    while(t--)
    {
        ll num, base;
        sc("%lld %lld",&num,&base);
        double ans=0;
        ans=ara[num];
        ans/=log((double)base);
        ans=floor(ans);
        ans+=1;
        ll x=ans;
        pf("Case %d: %lld\n",++cases,x);
    }
    return 0;
}