252662256 252662260
 141650963 141650963
 4 12
 1002523 1002523
 93 95
 331900277 331900277
 56 92
 10 100
 3 1000000000
 13 13
 2 879190747
 999900001 1000000000
 820844234 892579936
 419873015 419873018
 568814539 568814539
 999999937 999999937
 519002744 519002744
 80270976 80270977
 5 10
 3 6
 392602363 392602367
 6 12
 634097178 634097179
 6 15
 3 10
 305693653 305693653
 2 3
 1200007 1200007
 5 100
 10000019 10000019
 720270740 720270743
 94 95
 908580370 968054552
 760632746 850720703
 900000011 900000011
 37622224 162971117
 5 5
 76 134
 3 12
 39 91
 999992977 999992977
 17 17
 29 29
 770439256 770439256
 347877978 913527175
 3 8
 5 15
 349533413 349533413
 100000007 100000007
 104729 104729
 900000000 1000000000
 479001599 479001599
 999727999 999727999
 1717 1717
 15 27
 100003 100003
 51 52
 17 35
 1000003 1000003
 6 8
 11 11
 741254764 741254768
 2 2
 30 37
 2 1000000000
 4 8
 620769961 988145114
 951594860 953554446
 450868287 450868290
 575062045 575062049
 28829775 28829776
 999999797 999999797
 990000023 990000023
 871232720 871232722
 242 244
 273072892 273072894
 2 999999999
 7 7
 38 98
 39916801 39916801
 998244353 998244353
 3 111111
 3 3
 982451653 982451653
 3 18
 47 52
 999999103 999999103
 999999929 999999929
 3 99
 715827883 715827883
 12 18
 999999733 999999733

2
 141650963
 2
 1002523
 2
 331900277
 2
 2
 2
 13
 2
 2
 2
 2
 568814539
 999999937
 519002744
 2
 2
 2
 2
 2
 2
 2
 2
 305693653
 2
 1200007
 2
 10000019
 2
 2
 2
 2
 900000011
 2
 5
 2
 2
 2
 999992977
 17
 29
 770439256
 2
 2
 2
 349533413
 100000007
 104729
 2
 479001599
 999727999
 1717
 2
 100003
 2
 2
 1000003
 2
 11
 2
 2
 2
 2
 2
 2
 2
 2
 2
 2
 999999797
 990000023
 2
 2
 2
 2
 7
 2
 39916801
 998244353
 2
 3
 982451653
 2
 2
 999999103
 999999929
 2
 715827883
 2
 999999733

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

public class Main
{    
    public static void main(String[] args) throws IOException 
	{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		int l = Integer.parseInt(st.nextToken());
		int r = Integer.parseInt(st.nextToken());
		
		if(l == r) System.out.println(l);
		else System.out.println(2);
    }

    static double findDistanceBetweenTwoPoints(int x1, int y1, int x2, int y2){
        return Math.sqrt(Math.pow(x2-x1,2) + Math.pow(y2-y1,2));
    }

    static int[] countLetterFreqeuncy(String str, int[] ltrs){
        for(int i=0; i<str.length(); i++)
            ltrs[(int) (str.charAt(i) - 'a')]++;
        return ltrs;
    }
	
    static long gcd(long a, long b) { 
        if (a == 0) 
            return b;  
        return gcd(b % a, a);  
    } 
      
    static long lcm(long a, long b) { 
        return (a*b)/
        gcd(a, b); 
    } 

    // Arrays.sort(arr, new Comparator<Integer[]>() {
    //     @Override
    //             //arguments to this method represent the arrays to be sorted   
    //     public int compare(Integer[] arr1, Integer[] arr2) {
    //             //get the item ids which are at index 0 of the array
    //             Integer item1 = arr1[0];
    //             Integer item2 = arr2[0];
    //         // sort based on price
    //         return item1.compareTo(item2);
    //     }
    // });

    //String.join("", Collections.nCopies(n-1, "");

    static int binarySearch(int left, int right, int find, int[] arr){
        int mid = left + (right-left)/2;
        if(find == arr[mid]) return mid;
        else if(find < arr[mid]) return binarySearch(left,mid-1,find,arr);
        else return binarySearch(mid+1,right,find,arr);
    }

    static ArrayList<Integer> separateDigits(int num){
         int pow = 0;
         ArrayList<Integer> arr = new ArrayList<>();
         while(num != 0)
         {
             if(num % 10 != 0)
             {
                 arr.add((num % 10) * (int) Math.pow(10, pow));
             }
             num /= 10;
             pow++;
         }
         return arr;
     }

     //find pattern
//     for(int i = 0; i<n-1; i++)
//     {
//         for(int j = 0; j<m-1; j++)
//         {
//                 if(pixel[i].charAt(j)*pixel[i+1].charAt(j)*pixel[i].charAt(j+1)*pixel[i+1].charAt(j+1) == 'f'*'a'*'c'*'e')
//                     faceNum++;
//         }
//     }


// row and column checking
    // static boolean checkAllRows(String[] board)
    // {
    //     for(int i=0; i<board.length; i++)
    //     {
    //         for(int j=0; j<board.length; j++)
    //         {
    //             if(board[i].charAt(j) == 'B')
    //             {
    //                 return false;
    //             } 
    //         }
    //     }
    //     return true;
    // }

    

    class Pair implements Comparable<Pair>{
        int x;
        int y;
     
        public Pair(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        @Override
        public int compareTo(Pair p)
        {
            if(p.y == y)
            return x - p.x;
            return p.y - y;
        }
    }
}




