/* 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
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int c = 0;
		Incrementer f = (int a) -> {
			c += a;
			return c;
		};
		System.out.println(f.inc(1));
		System.out.println(f.inc(1));
	}
	
	
	interface Incrementer {
		int inc(int a);
	}
}