撰写#include<cstdio>
#include<string>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
long long l=1,r,mid,n,a;
int main(){
scanf("%lld",&n);
r=n;
while(l<r){
mid=(l+r)/2;
if(mid*(mid+1)/2<n)l=mid+1;
else r=mid;
}
a=n-l*(l-1)/2;
if(l%2==0)cout<<a<<'/'<<l+1-a;
else cout<<l+1-a<<'/'<<a;
return 0;
}