/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Scanner sc
=new Scanner
(System.
in); int n=sc.nextInt();
for(int i=0;i<n;i++){
}
int space=n/2;
for(int i=0;i<=(n/2);i++){
for(int j=space;j>0;j--){
}
for(int j=0;j<=i;j++){
}
space--;
}
}
}
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