6 6
 1 4
 4 4
 3 3
 6 4
 6 3
 5 4
 5 6
 3 4
 1 3
 3 2
 5 5
 1 1
 2 1
 3 1
 3 5
 1 6
 6 5
 2 3
 4 3
 2 2
 3 6
 1 2
 6 1
 2 5
 4 5
 1 5
 6 2
 4 6
 5 1
 4 1
 5 2
 2 4
 2 6
 5 3

1/6
 1/2
 1/2
 2/3
 1/6
 1/6
 1/3
 1/6
 1/2
 2/3
 2/3
 1/3
 1/1
 5/6
 2/3
 1/3
 1/6
 1/6
 2/3
 1/2
 5/6
 1/6
 5/6
 1/6
 1/3
 1/3
 1/3
 1/6
 1/6
 1/3
 1/2
 1/3
 1/2
 1/6
 1/3



import java.util.*;
import java.math.*;

public class DieRoll {

	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner stdin = new Scanner(System.in);
		int Y = stdin.nextInt();
		int W = stdin.nextInt();
		int U = Math.max(Y, W);
		int P = 7 - U;
		int gcd = gcd(P,6);
		P/=gcd;
		int denom = 6/gcd;
		System.out.println(P + "/" + denom);
		System.exit(0);
	}
	
	private static int gcd(int a, int b) {
		BigInteger b1 = BigInteger.valueOf(a);
	    BigInteger b2 = BigInteger.valueOf(b);
	    BigInteger gcd = b1.gcd(b2);
	    return gcd.intValue();
	}

}
