import java.util.Scanner;
public class Main{
    public static void main(String args[]){
    int n,k=1;
    Scanner in = new Scanner(System.in);
    n = in.nextInt();
    while(n>k){
    n=n-k;
    k++;
    }
    if(n%2==0)
    System.out.println(n+"/"+(k+1-n));
    else
    System.out.println((k+1-n)+"/"+n);
    }
    }
    
    

第三个测试点有错