#!/usr/bin/python

# Python program to multiply many large integers separated by spaces or newlines.
# The integers to multiply may be entered on the command-line or into standard input.

# Used by "primorial" with "matho-primes" to calculate large primorials.
# A primorial is the product of all primes up to a given number.

import string
import sys

prod = 1 # initialize product and make it an integer
args = sys.argv[1:]
if (args == []):
	# read stdin if no command line args
	while True:
		try:
			input_line = raw_input()
		except:
			break;
		for s in string.split(input_line):
			prod *= int(s)
else:
	# multiply together the command-line args
	for arg in args:
		prod *= int(arg)
print prod