/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
static double resta(double n, double m){
			return (n - m); }
		
		static double suma(double n, double m){
		return (n + m); }
		
		static double multiplica(double n, double m){
			return (n * m); }
		
		static double cuadrado(double n){
		return (n * n); } 
		
		
		
     public static void main (String[] args) throws java.lang.Exception	{
     
     System.out.println(resta(4, 10));
     System.out.println(suma(4, 10));
     System.out.println(multiplica(4, 10));
     System.out.println(cuadrado(10));
	
     	
     } // end main
} // end class