/******************************************************************************

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*******************************************************************************/

class Outer{
    
    int a,b;
    Outer(int x, int y){
        a=x;
        b=y;    
    }
    
    int area()
    {
        return a*b;
    }
    
    class Inner{        
        int c;
    Inner(int x){
        c=x;
    }
    
    int voulme()
    {
        return area()*c;
    }
        
        
    }
}

public class Main
{
	public static void main(String[] args) {

	Outer o1 = new Outer(10,20);
        
	Outer o2 = new Outer(30,40);

	Outer.Inner i1;
	i1= o1.new Inner(40);
	System.out.println(i1.voulme());
	
	i1= o2.new Inner(40);
	System.out.println(i1.voulme());
	
	
		
		
	}
}