import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Divisors {

	public static void main(String[] args) throws IOException {
		BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
		String[] s = r.readLine().split(" ");
		int I = Integer.parseInt(s[0]);
		int J = Integer.parseInt(s[1]);
		List[] divs = div(J);
		double minTriv = Double.POSITIVE_INFINITY;
		int min = -1;
		for(int i = I; i <= J; i++) {
			int sum = 0;
			@SuppressWarnings("unchecked")
			List<Integer> d = divs[i];
			for(int di : d) {
				sum += di;
			}
			double triv = sum / i;
			if(triv < minTriv) {
				minTriv = triv;
				min = i;
			}
		}
		System.out.println(min);
	}


	@SuppressWarnings("unchecked")
	private static List[] div(int j) {
		List[] divisors = new List[j + 1];
		for(int d = 1; d <= j; d++) {
			int c = 2;
			int mul;
			while((mul = c * d) <= j) {
				if(divisors[mul] == null) {
					divisors[mul] = new ArrayList();
				}
				divisors[mul].add(d);
				c++;
			}
		}
		return divisors;
	}

}