#include<stdio.h>
#include<conio.h>
void main()
{
 int n,i,j,c=40,r=7;
 clrscr();
 printf("enter value of n;");
 scanf("%d",&n);
 for(i=n;i>0;i--)
  {
   gotoxy(c,r);
   for(j=1;j<=i;j++)
    {
     if((i%2==0 && j%2!=0)||(i%2!=0 && j%2==0))
     printf("0");
     else
     printf("1");
    }
   c++;r++;
  }
 getch();
 }