import java.util.Scanner;

public class A231 {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int count = 0;
        int result = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < 3; j++) {
                int a = scanner.nextInt();
                if(a > 0) {
                    count++;
                }
            }
            if (count >= 2) {
                result++;
            }
            count = 0;
        }
        System.out.println(result);
    }
}