1 /*
 2 author:jxy
 3 lang:C/C++
 4 university:China,Xidian University
 5 **If you need to reprint,please indicate the source**
 6 */
 7 #include <iostream>
 8 #include <cstdio>
 9 #include <cstdlib>
10 #include <cstring>
11 #include <algorithm>
12 using namespace std;
13 int dp[10005];
14 void pre()//dp用
15 {
16     memset(dp,123,sizeof(dp));
17     dp[1]=0;
18     int Max=10001,i,j;
19     for(i=1;i<=Max;i++)
20         for(j=1;j<=i&&i+j<=Max;j++)
21             dp[i+j]=min(dp[i+j],dp[i]+1);
22 }
23 int main()
24 {
25     int n,C=0;
26    // pre();
27     while(~scanf("%d",&n)&&n>=0)
28         printf("Case %d: %d\n",++C,n==1?0:(int)log2(n-1)+1);
29 }