import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		long first = sc.nextLong();
		long last = first;
		for (int i = 1; i < n; i++) {
		    last = sc.nextLong();
		}
		System.out.println(last + "/" + first);
	}
}