#include<iostream>
#include<cstdio>
using namespace std;

int main()
{
	int n;
	cin >> n;
	int a = 1, b = 1, x = 2;
	for(int i = 2;i <= n;i++)
	{
		if(b-1 == 0)
		{
			x++;
			b = x-1;
			a = 1; 
			continue;
		}
		a++;
		b--;
	}
	cout << a << "/" << b;
	return 0;
}