import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n=sc.nextInt(); int ans=0; for(int i=0;i<n;i++) { int chinese=sc.nextInt(); int math=sc.nextInt(); int english=sc.nextInt(); int average=(chinese+math+english)/3; if(average<60) { ans++; } } System.out.println(ans); } }