# 
# Solution to Project Euler problem 4
# Copyright (c) Project Nayuki. All rights reserved.
# 
# https://www.nayuki.io/page/project-euler-solutions
# https://github.com/nayuki/Project-Euler-solutions
# 


# Computers are fast, so we can implement this solution directly without any clever math.
def compute():
	ans = max(i * j
		for i in range(100, 1000)
		for j in range(100, 1000)
		if str(i * j) == str(i * j)[ : : -1])
	return str(ans)


if __name__ == "__main__":
	print(compute())