import java.io.*;
public class copier {

	
	public static void main (String[] args) {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	
		try{
		while (true){
			
			int firstTry;
			int secondTry;
			int[] nums;
			String[] numStrings=in.readLine().split(" ");
			nums= new int[numStrings.length];
			
			
			for(int k=0;k<numStrings.length;k++){
				nums[k]=Integer.parseInt(numStrings[k]);	
			}
			if (nums[0]==0) break;
			firstTry=compare(nums[0], nums[1], nums[2], nums[3]);
			secondTry=compare(nums[1], nums[0], nums[2], nums[3]);

			if (firstTry>=100 || secondTry>=100){
				System.out.println("100%");
				
			}
			else{
				if (firstTry<secondTry){
					System.out.println(secondTry+"%");
					
				}
				else{
					System.out.println(firstTry+"%");
					
				}
			}
		}
		}
		catch(IOException e) {
			
		}
	}
	
	public static int compare(int height, int width,int blankHeight, int blankWidth){
		double one= ((double)blankHeight/(double)height)*100;
		double two= ((double)blankWidth/(double)width)*100;
		
		if (one<two) return (int)one;
		else return (int) two;
	}
}