BAEKJOON_1193

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


public class Main {
    public static void main(String[] args) throws IOException {

        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));

        int n =1; // 몇 번째 행인가??

        int X = Integer.parseInt(br.readLine());

        if(X==1){
            System.out.println("1/1");
            System.exit(0);
        }
        int i=2;
        int sum=1;
        while(true){
            sum = sum+i;     // sum =3
            n++;      //시작하자마자 2
                            //i =2

            if(X <= sum) {
                if (n % 2 == 0) {
                    System.out.println((X-sum+n)+"/"+(sum-X+1));
                } else {
                    System.out.println((sum-X+1)+"/"+(X-sum+n));
                }
                break;
            }

            i++;
        }




    }
}