#include<bits/stdc++.h>
using namespace std;
long long n,k = 1;
int main()
{
	cin >> n;
	while(n>k){
		n = n-k;
		k++;
	}
	if(n%2 == 0) cout << n << "/" << k+1-n;
	else cout << k+1-n << "/" << n;
	return 0;
}