#include<iostream>
using namespace std;
int main(){
   float a,m;
   int b,c,d,e,f,g,h;
   cin>>a;
   b=a*10;
   c=b/1000;
   d=b%1000;
   e=d/100;
   f=d%100;
   g=f/10;
   h=f%10;
   m=(h*1000+g*100+e*10+c)*0.1;
   cout<<m<<endl;
   return 0;
}