#1999普及组#cantor表

 

#include <iostream>
using namespace std;

int main(){
    int line,n,i;
    cin>>n;
    for(line=1;n>line;line++)
       n-=line;
    if(line%2==0)//line为偶数
       cout<<n<<'/'<<line-n+1<<endl;
    else 
       cout<<line-n+1<<'/'<<n<<endl;
    return 0;
}