r, y, g = input().split()
r, y, g = int(r), int(y), int(g)
n = int(input())
time = 0
for i in range(n):
k, t = input().split()
k, t = int(k), int(t)
if k==0:
time += t
elif k==1:
time += t
elif k==2:
time += (t + r)
#else:
# do nothing
print(time)
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