int main()
{	
int n;	
scanf("%d",&n);	
int x,y,a;	
int i=0,b=0;	
if(n==1)	
{	  
scanf("%d %d",&x,&y);	  
if(x<90||x>140||y<60||y>90)	 
 {	 
   b=0; 
	  }
	  else	
  {	  
  b=1;	 
 }	
}	
else
	{	
  while(1)	
  {	  
  i++;		
if(i==n+1)	
	{	
	  a=n+1;
		  b=n;	
	  break;	
	}		
scanf("%d %d",&x,&y);	
	if(x<90||x>140||y<60||y>90)	
	{		
  a=i;		
  b=a-b-1;	
	  break;
		}
	  }	 
 while(i<=n&&i>=a)	
  {	
    i++;
		if(i==n+1)
		{	
	  if(n-a>b)	
	  {		
    b=n-a;		
	break;		
  }		  else	
	  {		    b=b;			break;		  }		}		scanf("%d %d",&x,&y);		if(x<90||x>140||y<60||y>90)		{		  if(i-a-1>b)		  {		    b=i-a-1;			a=i;		  }		  else		  {		    b=b;			a=i;		  }		}	  }	}	printf("%d",b);	return 0;}
