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

public class copier {
	
	// take an array, return the first two values in opposite places
	private static int[] flip(int[] array) {	
		int[] temp = {array[1],array[0]};
		return temp;
	}
	
	// return the percent we must scale the image to fit it on the page
	private static int percentScale(int[] image, int[] page) {
		int xscale = 100;
		if(page[0] < image[0]) xscale = 100*page[0]/image[0];
		int yscale = 100;
		if(page[1] < image[1]) yscale = 100*page[1]/image[1];
		return Math.min(xscale,yscale);
	}
	
	public static void main(String[] args) {
		
		// create our stdin reader
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter stdout = new BufferedWriter(new OutputStreamWriter(System.out));
		
		// for each input of dimensions
		while(true) {
			
			// this will hold the numbers (as strings)
			String[] str_dim;
			
			// try to read in the line
			try {
				str_dim = stdin.readLine().split(" ");
			} catch(IOException e) {
				System.out.println(e);
				break;
			}
			
			// put the x,y of the image into image_dim, and ditto with the page
			int[] image_dim = {Integer.parseInt(str_dim[0]),Integer.parseInt(str_dim[1])};
			int[] page_dim = {Integer.parseInt(str_dim[2]),Integer.parseInt(str_dim[3])};
			
			// if it starts with zero, we're done (leave)
			if(image_dim[0] == 0) break;
			
			// try to write the answer
			try {
				System.out.print(Math.max(percentScale(image_dim,page_dim), percentScale(flip(image_dim),page_dim)));
				System.out.print("%\n");
				stdout.write(Math.max(percentScale(image_dim,page_dim), percentScale(flip(image_dim),page_dim)));
				stdout.write("%\n");
			} catch(IOException e) {
				System.out.println(e);
				break;
			}
			
		}
	}
	
}