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https://github.com/Kiritow/OJ-Problems-Source.git
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19 lines
271 B
C
19 lines
271 B
C
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#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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int n;
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scanf("%d",&n);
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double ans=0;
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if(n%2==1)
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{
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for(int k=1;k<=n;k+=2) ans+=1.0/k;
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}
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else
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{
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for(int k=2;k<=n;k+=2) ans+=1.0/k;
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}
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return printf("%f\n",ans),0;
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}
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