import java.util.Scanner;
public class Calculator
{
	public double Add(double number1,double number2)
	{
		return number1+number2;
	}
	public double Subtract(double number1,double number2)
	{
		return number1-number2;
	}
	public double Multiple(double number1,double number2)
	{
		return number1*number2;
	}
	public double Divide(double number1,double number2)
	{
		return number1/number2;
	}
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		double number1 = sc.nextDouble();
		double number2 = sc.nextDouble();
		System.out.println();//这里怎么弄才可以？
	}
}

Calculator calculator = new Calculator();
System.out.println(calculator.Add(number1,number2));