/* 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. */
interface Numbers{
	public int process(int x,int y);
}
class Sum implements Numbers{
	public int process(int x,int y){
		return(x+y);
	}
}
class Average implements Numbers{
	public int process(int x,int y){
		return((x+y)/2);
	}
}
class Ideone{
	// your code goes here
	public static void main(String[] args){
		Sum a=new Sum();
		int sum=a.process(3,4);
		System.out.println(sum);
		Average b=new Average();
		int avg=b.process(3,4);
		System.out.println(avg);
	}	
}

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