import java.util.Scanner;


public class Main_yukicoder356 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long t1 = sc.nextInt();
        long t2 = sc.nextInt();
        long t3 = sc.nextInt();

        long tmp1 = (t3 - t2) * t1;
        long tmp2 = (t3 - t1) * t2;
        long tmp3 = (t2 - t1) * t3;

        long gcd = gcd(tmp1, tmp2);
        gcd = gcd(gcd, tmp3);

        long ret1 = t1 * t2 * t3;
        long ret2 = gcd;

        System.out.printf("%d/%d\n", ret1 / gcd(ret1, ret2), ret2 / gcd(ret1, ret2));

        sc.close();
    }

	private static long gcd(long n, long m) {
		if (m == 0) {
			return n;
		} else {
			return gcd(m, n % m);
		}
	}
}