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#include <cstdio>
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using namespace std;
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int main()
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{
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int m,n;
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scanf("%d",&m);
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while(m--){
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scanf("%d",&n);
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double ans=0;
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for(int i=1;i<=n;i++)
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ans+=((i&1)?1.0:-1.0)/i;
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printf("%.2lf\n",ans);
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}
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return 0;
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}
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