n = int(input())
i = 0
sum = 0
while i < n:
a, b=map(int, input().split())
sum = sum + a*b
i = i + 1
if sum >= 0:
sum = sum
elif sum <= 0:
sum = 0
print(sum)
n = int(input())
i = 0
sum = 0
while i < n:
a, b=map(int, input().split())
sum = sum + a*b
i = i + 1
if sum >= 0:
sum = sum
elif sum <= 0:
sum = 0
print(sum)名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
