help me pls

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.WeakHashMap;

public class KenKen {

	public static void main(String[] args) throws FileNotFoundException {
		Scanner in = new Scanner(new File("KenKen.dat"));

		while (in.hasNextLine()) {
			//String line = in.nextLine();
			Map<String, Integer> map = new WeakHashMap<String, Integer>();
			List<Integer> intsList = new ArrayList<Integer>() {
				/**
				 *
				 */
				private static final long serialVersionUID = 1L;

				{
					add(1);
					add(2);
					add(3);
					add(4);
					add(5);
					add(6);
				}
			};

			String line1 = in.nextLine();
			String line2 = in.nextLine();
			String line3 = in.nextLine();

			System.out.println(line1 + " " + line2 + " " + line3);
			map.put(line1.split(" ")[0],
					Integer.parseInt(line1.split(" ")[1]));
			map.put(line2.split(" ")[0],
					Integer.parseInt(line2.split(" ")[1]));
			map.put(line3.split(" ")[0],
					Integer.parseInt(line3.split(" ")[1]));
			if (in.hasNextLine())
				in.nextLine();
			System.out.println("Size: " + map.size());

			List<String> solutions = new ArrayList<String>();
			List<Integer> usedNums = new ArrayList<Integer>();
			for (Entry<String, Integer> entry : map.entrySet()) {
				System.out.println(entry.getKey() + " " + entry.getValue());
				innerloop: for (int i = 0; i < intsList.size(); i++) {
					int num1 = intsList.get(i);
					for (int j = 0; j < intsList.size(); j++) {
						int num2 = intsList.get(j);
						if (makesNum(num1, num2, entry.getValue(),
								entry.getKey())
								&& !usedNums.contains(num1)
								&& !usedNums.contains(num2)) {
							String s = num1 + " " + num2;
							solutions.add(s);
							System.out.println("Found solution for "
									+ entry.getKey() + " " + entry.getValue()
									+ ". It's " + num1 + " " + num2);
							usedNums.add(num1);
							usedNums.add(num2);
							break innerloop;
						}
					}
				}
			}
			if (solutions.size() == 3) {
				System.out.println("Possible.");
			} else {
				System.out.println("Not Possible.");
			}
			System.out.println("\n");
		}
		in.close();
	}

	private static boolean makesNum(int i, int j, int num, String op) {
		if (op.equalsIgnoreCase("+"))
			return i + j == num;
		else if (op.equalsIgnoreCase("-"))
			return (i - j == num) || (j - i == num);
		else if (op.equalsIgnoreCase("*"))
			return i * j == num;
		else {
			return ((((double)i) / j) == (double) num) || ((((double)j) / i) == (double) num);
		}
	}
}