package no1xxx;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;

public class No1152 {
	static Scanner in;
	static PrintWriter out;
	static String INPUT = "";
	
	static int[] dec(int x)
	{
		int mx = 0, my = 0;
		while(x % 2 == 0){
			x /= 2;
			mx++;
		}
		while(x % 5 == 0){
			x /= 5;
			my++;
		}
		return new int[]{mx, my};
	}
	
	static int enc(int[] a)
	{
		int ret = 1;
		for(int i = 0;i < a[0];i++)ret *= 2;
		for(int i = 0;i < a[1];i++)ret *= 5;
		return ret;
	}
	
	static void solve()
	{
		int x1 = ni();
		while(true){
			int x2 = ni();
			if(x1 == x2)break;
			int[] my = dec(x1);
			int[] en = dec(x2);
			if((my[0]^en[0]^my[1]^en[1])%2 == 0){
				if(my[0] < 7){
					my[0]++;
				}else if(my[0] > 7){
					my[0]--;
				}else if(my[1] < 9){
					my[1]++;
				}else{
					my[0] += 2;
				}
			}else{
				if(Math.abs(my[0] - en[0]) > Math.abs(my[1] - en[1])){
					if(my[0] < en[0]){
						my[0]++;
					}else{
						my[0]--;
					}
				}else{
					if(my[1] < en[1]){
						my[1]++;
					}else{
						my[1]--;
					}
				}
			}
			int to = enc(my);
			out.println(to);
			out.flush();
			if(to == x2)break;
			x1 = to;
		}
	}
	
	public static void main(String[] args) throws Exception
	{
		in = INPUT.isEmpty() ? new Scanner(System.in) : new Scanner(INPUT);
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
	}
	
	static int ni() { return Integer.parseInt(in.next()); }
	static long nl() { return Long.parseLong(in.next()); }
	static double nd() { return Double.parseDouble(in.next()); }
	static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}