import java.util.Scanner;
public class Test6 {
public static void main(String[] args)
{
int i;
float sum=0;
Scanner scanner=new Scanner(System.in);
System.out.print("输入n:");
int n=scanner.nextInt();
for(i=1;i<=n;i++)
{
sum+=1/(3*i);
}
System.out.print(sum);
}
}
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