#include<stdio.h>
  
using namespace std;
  
int main()
  
{
  
	  float a,h,s;
    
	  int b,c,d,x;
    
	  cin>>a;
	
	  a=x;
    
	  b=a/100;
    
	  c=x%100/10;
    
	  d=x%100%10;
    
	  h=a-(b+c+d);
    
	  s=h*10+d*0.1+c*0.01+b*0.001;
    
	  cout<<s<<endl;
    
return 0;
  
}