#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

ull GCD(ull a,ull b){ return b?GCD(b,a%b):a; }

int main(){
  double Xf; cin>>Xf;
  ull a=Xf*1.0e8+0.5, b=100000000;
  if(a==0) cout<<"0/1\n";
  else{
    ull g=GCD(a,b);
    a/=g; b/=g;
    cout<<a<<"/"<<b<<"\n";
  }
  return 0;
}