# 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)