import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner=new Scanner(System.in); int n=scanner.nextInt(); int z=2; int m=1; double sum=z*1.0/m; for(int i=1;i<n/2;i++){ int t=z; z+=m; m=t; sum+=z*1.0/m; t=z; z+=m; m=t; sum+=z*1.0/m; } System.out.printf("%.2f\n",sum); } } |
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