print('input ?!')
n = int(input())
print('input number of items')
m = int(input())
i = 0
j = n - m
factorial_n = 1
while i < n:
    i += 1
    factorial_n = factorial_n * i
factorial_j = 1
while i < j:
    i += 1
    factorial_j = factorial_j * i
factorial_m = 1
while i < m:
    i += 1
    factorial_m = factorial_m * i
combination_m = factorial_n / (factorial_j * factorial_m)
result = 'factorial ' + str(n) + ' = ' + str(factorial_n) + '\n' + 'combination ' + str(m) + ' = ' + str(combination_m)
print(result)