너의 평점은

import sys


def main():
    input = sys.stdin.readline

    total_credit = 0.0
    total_grade = 0.0

    for _ in range(20):
        args = input().split()

        credit = float(args[1])
        grade = args[2]

        if grade == "P":
            continue

        grade_letters = ["A+", "A0", "B+", "B0", "C+", "C0", "D+", "D0", "F"]
        grade_values = [4.5, 4.0, 3.5, 3.0, 2.5, 2.0, 1.5, 1.0, 0.0]

        grade_value = grade_values[grade_letters.index(grade)]

        credit_sum += credit
        grade_sum += credit * grade_value


main()