from pprint import pprint

def search(l, key):
	for ix, x in enumerate(l):
		for iy, y in enumerate(l):
			for iz, z in enumerate(l):

				if x + y + z == key:
					return x, y, z

with open("sum.txt", "r", encoding="utf-8") as f:
	s = f.read()
ls = s.split()
l = [int(x) for x in ls]
x, y, z = search(l, 2020)
pprint((x, y, z))
print(x*y*z)