#include<iostream>         
using namespace std;
int main()
{
    int n=0,k=1,sum=0;
    cin>>n;
    while(1)
    {
        sum+=k;
        if(n<=sum)
        {
            cout << n-(sum - k) << "/" << k+1-(n-(sum-k));
            break;
        }
        k++;
    }
}