new_contents: if __name__ == "__main__":
  	ans = {}
  	ans[3] = {}
  	for a in range(0, 10):
  		ans[3][a] = {}
  		for b in range(0, 10 - a):
  			ans[3][a][b] = 10 - a - b
  	for n in range(4, 21):
  		ans[n] = {}
  		for a in range(0, 10):
  			ans[n][a] = {}
  			for b in range(0, 10 - a):
  				ans[n][a][b] = 0
  				for c in range(0, 10 - a - b):
  					ans[n][a][b] += ans[n - 1][b][c]
  	ret = 0
  	for a in range(1, 10):
  		for b in range(0, 10 - a):
  			ret += ans[20][a][b]
  	print ret
subject: add 164