def team(list_of_problems): count = 0 for slist in list_of_problems: if slist[0] == 1 and slist[1] or slist[1] == 1 and slist[2] or slist[0] == 1 and slist[2]: count= count + 1 return count if __name__ == '__main__': word = int(input()) list_of_problems = [] for _ in range(0,word): list_of_problems.append(list(map(int,input().split()))) print(team(list_of_problems))