#include<iostream>
#include<cmath>
using namespace std;
int main(){
    int n;
    cin>>n;
    int k=ceil((sqrt(8*n+1)-1)/2);
    int s=(k-1)*k/2;
    int a=n-s;
    if(k%2==0)
        cout<<a<<"/"<<k-a+1;
    else
        cout<<k-a+1<<"/"<<a;
    return 0;
}