#include<iostream>
using namespace std;

int main()
{
	int n; 
	cin >> n;
	for(int i =n;i>=1;i--)
	{
	if(i*(i+1)/2 -i+1<=n&&n<=i*(i+1)/2)
	{
		cout<<n-(i*(i+1)/2 -i)<<"/"<<i+1-(n-(i*(i+1)/2 -i));
	}
    }
	return 0;
}