import java.util.Scanner;

public class Test {
	public static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
		int n = sc.nextInt();
		long a = sc.nextLong(), b = 0;
		for (int i = 1; i < n; i++) {
			b = sc.nextLong();
		}
		System.out.println(b + "/" + a);
	}
}