#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define N 10000010
using namespace std;
int n,s,q,s1,s2;
int read()
{
    ,f=; char ch=getchar();
    ;ch=getchar();}
    +ch-',ch=getchar();
    return x*f;
}
int main()
{
    n=read();
    ;i;i++)
     if((s+=i)>=n)
     {
         s-=i;
         q=i; break;
     }
    ==)
    {
        s1=n-s;
        s2=q-(n-s-);
    }
    else
    {
        s2=n-s;
        s1=q-(n-s-);
    }
    printf("%d/%d",s1,s2);
    ;
}