http://codeforces.com/problemset/problem/231/A
import java.util.Scanner;
public class Team {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int sum = 0;
for(int i = 0; i < n; i++) {
int j = 0;
for(int k = 0; k < 3; k++) {
int a = scanner.nextInt();
if(a > 0) j++;
}
if(j >= 2) sum++;
}
System.out.println(sum);
}
}