题解 | #小乐乐算多少人被请家长#

import java.util.Scanner;
public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int count = 0;
        for(int i = 0 ; i < n ; i++) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            int c = sc.nextInt();
            double avg = (a + b + c)*1.0 / 3;
            if(avg < 60) {
                count++;
            }
        }
        System.out.println(count);
    }
}