Hackerearth Pr1.

'''

# Sample code to perform I/O:

name = input() # Reading input from STDIN

print('Hi, %s.' % name) # Writing output to STDOUT

# Warning: Printing unwanted or ill-formatted data to output will cause the test cases to fail

'''

# Write your code here

#let's begin

t = int(input('Enter the number of test cases: '))

pr_list = []

for x in range(0, t):

grcost, prcost = input('Enter price of green and purple balloon respectively: ').split()

n = int(input('Enter the number of participants: '))

for y in range(0, n):

points = input("0 or 1 for 1st problem and 2nd problem respectively: ").split()

pr_list.append(points)

points = []

sum1 = 0

sum2 = 0

for z in range(0, n):

sum1 = sum1 + pr_list[z][0]

sum2 = sum2 + pr_list[z][1]

if sum1 > sum2 and grcost > prcost or sum2 > sum1 and grcost < prcost:

print((sum1 * prcost) + (sum2 * grcost))

elif sum1 >= sum2 and grcost <= prcost or sum1 < sum2 and grcost > prcost:

print((sum1 * grcost) + (sum2 * prcost))