import java.util.*;
public class Team {
public static void main(String[] args) {
Scanner inScanner = new Scanner(System.in);
int n = inScanner.nextInt();// ini
int count = 0;
while (n > 0) {
int a, b, c;
a = inScanner.nextInt();
b = inScanner.nextInt();
c = inScanner.nextInt();
if ((a + b + c) >= 2)
count++;
n--;
}
System.out.println(count);
}
}