# 输入学生姓名和三科成绩
student_name = input("请输入学生姓名：")
subject1 = float(input("请输入第一科成绩："))
subject2 = float(input("请输入第二科成绩："))
subject3 = float(input("请输入第三科成绩："))

# 计算总分
total_score = subject1 + subject2 + subject3

# 确定等级
if total_score >= 270:
    grade = "A"
elif total_score >= 240:
    grade = "B"
elif total_score >= 210:
    grade = "C"
elif total_score >= 180:
    grade = "D"
else:
    grade = "F"

# 确定是否及格
passing_grade = 180  # 及格线
if total_score >= passing_grade:
    passing_status = "及格"
else:
    passing_status = "不及格"

# 输出结果
print("学生姓名：", student_name)
print("第一科成绩：", subject1)
print("第二科成绩：", subject2)
print("第三科成绩：", subject3)
print("总分：", total_score)
print("等级：", grade)
print("是否及格：", passing_status)