uplim = int(input('Enter an upper limit (inclusive)'))
choice = input('Odds or Evens (o or e):')
##
##if choice == 'o':
##    product = 1
##    for i in range(1,uplim+1,2):
##        product *= i
##    print(product)
##else:
##    product = 1
##    for i in range(2,uplim+1,2):
##        product *= i
##    print(product)

if choice == 'o':
    start = 1
else:
    start = 2

product = 1
for i in range(start,uplim+1,2):
    product *= i
print(product)