#include<stdio.h>
void main()
{
int i,n,no_,number_of_repeat;
n=0;
printf("Enter no. of repeatation:\t");
scanf("%d", &number_of_repeat);
lable:
n++;
i=1;
if((n%2)==0)
{
no_=2;
}
else
{
no_=1;
}
for(i=1;i<=n;i++){
printf("%d",no_);
}
printf("\t");
if(n<number_of_repeat)
{
goto lable;
}
}