import re


regex = r"mul\((\d{1,3}),(\d{1,3})\)"
c = re.compile(regex)

def process_line(line):
	return sum([int(x)*int(y) for x, y in c.findall(line)])

#test = "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"

result = 0
with open("input", "r") as fp:
	while (line := fp.readline()):
		result += process_line(line)

print(f"The sum of all multiplications equals {result}.")