2022-08-18 09:19:19 +08:00
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//<2F><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һλ<D2BB><CEBB><EFBFBD>ֶԲ<D6B6><D4B2><EFBFBD>
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2022-08-17 10:22:11 +08:00
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#include <iostream>
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#include<cstdio>
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#include<algorithm>
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#include <cmath>
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#include <cstdlib>
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using namespace std;
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const int N=1e8;
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2022-08-18 09:19:19 +08:00
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const int w=50;
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double a[N/w+5];
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2022-08-17 10:22:11 +08:00
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int t,n;
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int t1;
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inline void cun()
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{
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2022-08-18 09:19:19 +08:00
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int cur=1;
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for(int i=1;i<=N;i++)
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2022-08-17 10:22:11 +08:00
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{
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2022-08-18 09:19:19 +08:00
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a[cur]+=(1.0/i);
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if(i%w==0)
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{
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// printf("%llf,",a[cur]);
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cur++;
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a[cur]=a[cur-1];
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}
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2022-08-17 10:22:11 +08:00
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}
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}
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//void ce()
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//{
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// cout<<cnt;
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// for(int i=1;i<=cnt;i++)
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// {
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// cout<<pr[i]<<" ";
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// }
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//}
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int main()
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{
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2022-08-18 09:19:19 +08:00
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cun();
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// ce();
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scanf("%d",&t);
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while(t--)
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{
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scanf("%d",&n);
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int now=n/w;
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double ans=a[now];
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for(int i=now*w+1;i<=n;i++)
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{
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ans+=(1.0/i);
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}
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2022-08-18 10:53:07 +08:00
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printf("Case %d: %.10lf\n",++t1,ans);//WA<57><41><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> lf->double <20><><EFBFBD><EFBFBD>llf
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2022-08-18 09:19:19 +08:00
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}
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2022-08-17 10:22:11 +08:00
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return 0;
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}
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