#include<bits/stdc++.h>
using namespace std;
#include<string.h>

int main(){
	int n,sn=0,a=0,m=0;
	cin >> n;
	while(1){
		m+=1;
		sn += m;//等差求和 
		a++; //计算在第几行 
		if(sn>=n) break;  
	}
	//计算在第几个
	int x = n-(sn-m); 
	cout << x << "/" << (a-x+1);

}