分數

import java.math.BigInteger;
/*    1048575/524288
public class Main{
	
	public static void main(String[] args) {
		BigInteger two = BigInteger.valueOf(2);
		BigInteger a = two.pow(20).subtract(BigInteger.ONE);
		BigInteger b = two.pow(19);
		BigInteger gcd = a.gcd(b);
		System.out.println(gcd);
		System.out.println(a+"/"+b);
	}
}*/
public class Main{
	
	public static void main(String[] args) {
		int a = (int) (Math.pow(2, 19));
		int ans = 0;
		for(int i = 0;i < 20;i++) {
			int b = (int)Math.pow(2, i);
			ans += b;
		}
		System.out.println(ans+"/"+a);
	}
}