import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		BigDecimal x = sc.nextBigDecimal();
		sc.close();

		long m = 1000000000;
		x = x.multiply(BigDecimal.valueOf(m));
		long n = x.longValue();
		long g = gcd(n, m);
		n /= g;
		m /= g;
		System.out.println(n + "/" + m);
	}

	static long gcd(long a, long b) {
		return b == 0 ? a : gcd(b, a % b);
	}
}