#include<bits/stdc++.h>
using namespace std;
int n, ans;
int main()
{
	cin>>n;
	for(int i=1;i<=10000000;i++)
	{
		if((1+i)*i/2>n)
		{
			ans=i-1;
			break;
		}
	}
	int sum=n-(1+ans)*ans/2;
	if(sum!=0)
	{
		if((ans+1)%2==0)
		{
			cout<<sum<<"/"<<ans+2-sum;
		}
		else
		{
			cout<<ans+2-sum<<"/"<<sum;
		} 
	}
	else
	{
		if((ans+1)%2==0)
		{
			cout<<1<<"/"<<ans+2-sum;
		}
		else
		{
			cout<<ans+2-sum<<"/"<<1;
		} 
	}
	return 0;
}