q181. 1. 等紅綠燈 -- 2025年1月 APCS

green,red = map(int, input().split())
student = int(input())
sec = red + green
student_time = list(map(int, input().split()))
RedLightWait = list()
sum = 0
for i in range(student):
    if student_time[i] % sec > green:
        sum = sum + (red - (student_time[i] % sec - green))
    elif student_time[i] % sec == green:
        sum = sum + red
print(sum)