#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,h=0,j,i=1;
	cin>>n;
	for (;i<=10000;i++){
		h=h+i;
		if(n<=h){
		   j=n-(h-i);
		   i++;
		   break;}
	}
	if(i%2==0){
		cout<<(i-j)<<"/";
		cout<<j;
	}
	else{
		cout<<j<<"/";
		cout<<(i-j);
	}
	return 0;
}