import java.util.Scanner;
public class test{
public static void main(String[] args){
Scanner s=new Scanner(System.in);
System.out.println("请输入n: ");
int n=s.nextInt();
int den=0;
double sum=0.0;
for(int i=1;i<=n;i++){
den+=i;
sum+=1.0/den;
}
System.out.println("The result is : "+sum);
}
}
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