# r y g 表示红绿灯的设置
# n 红绿灯个数
# k=0 没有信号灯耗时t
# k(1,3)表示 剩余t秒信号灯信息

r,y,g = map(int,input().split())
n = int(input())
s_time = 0
for i in range(n):
    k,t = map(int,input().split())
    if(k==0):
        s_time = s_time + t
    if(k==1):
        s_time = s_time + t
    if(k==2):
        s_time = s_time + t + r
print(s_time)