Permutations
import sys
if len(sys.argv) != 2:
exit(f"Usage: {sys.argv[0]} n")
'''
n!
'''
n = int(sys.argv[1])
n_fact = 1
for i in range(1, n+1):
n_fact *= i
print(n_fact)
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import sys
if len(sys.argv) != 2:
exit(f"Usage: {sys.argv[0]} n")
'''
n!
'''
n = int(sys.argv[1])
n_fact = 1
for i in range(1, n+1):
n_fact *= i
print(n_fact)