/* 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
{
{
// your code goes here
Scanner s
=new Scanner
(System.
in); int count=s.nextInt();
for(int i=1;i<=count;i++)
{
if(i%2==0)
{
for(int k=i;k>=1;k--)
{
}
}
else
{
for(int j=1;j<=i;j++)
{
}
}
}
}
}
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