package My;

import java.util.Scanner;
public class Example3_3 
{
	public static void main(String args[])
	{
		Scanner scan=new Scanner(System.in);
		System.out.println("请输入x:");
		double x=scan.nextDouble(),y;		
		if(x<=0)
		{
			y=5*x;
		}
		else
		{
			y=1+2*x;
		}
		System.out.println("y="+y);				
	}
}