#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	long i,n,m;
	scanf("%d",&n);
	for (i=1;i<=3000;i++)
		{
			if (n>i*(i-1)/2&&n<=i*(i+1)/2)
				break;
		}
	if (i%2==0)
		m=n-i*(i-1)/2;	
	if (i%2==1)
		m=i+1-(n-i*(i-1)/2);
	printf("%d/%d",m,i+1-m);
	return 0;
}```