201812-02 小明放学 （Python实现）

r, y, g = input().split()
r, y, g = int(r), int(y), int(g)
n = int(input())
time = 0
stat_time_list = []
def transfer(stat_time, passedTime):
    time_in_scale = 0
    origi_k = stat_time[0]
    origi_t = stat_time[1]
    if origi_k==0:
        return origi_k,origi_t
    
    if origi_k==1:
        time_in_scale = r - t
    elif origi_k==3:
        time_in_scale = (r+g) - t
    else:
        time_in_scale = (r+g+y) - t
    passedTime = (passedTime+time_in_scale) % (r+y+g)

    if passedTime<=r:
        return 1, r-passedTime
    elif passedTime>r and  passedTime<=r+g:
        return 3, (r+g)-passedTime
    else:
        return 2, (r+g+y)-passedTime

for i in range(n):
    k, t = input().split()
    k, t = int(k), int(t)
    stat_time_list.append([k ,t])

for stat_time in stat_time_list:
    k = stat_time[0]
    t = stat_time[1]
    #计算达到时刻的k和t
    k, t = transfer(stat_time, time)
    if k==0:
        time += t
    elif k==1:
        time += t
    elif k==2:
        time += (t + r)
    #else:
        # do nothing
print(time)