#include <iostream> using namespace std; int main(void) { int a,b,n,i=0,sum=0; cin>>n; while(sum<n) { i++; sum +=i; } if(i%2==0) { a = n-sum+i; b = i+1-a; cout<<a<<"/"<<b<<endl; } else { a = n-sum+i; b = i+1-a; cout<<b<<"/"<<a<<endl; } return 0; }