import java.util.Scanner;
	

public class Main{
	
	
	public static void main(String args[])throws Exception{
		
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		for(int i=0;i<N;i++){
			int T = sc.nextInt();
			String S = sc.next();
			int L = S.length();
			if(12*T/1000>=L){
				ans++;
			}
		}
		System.out.println(ans);
	}
}