how many 4 - digit numbers that do not contain the digits 2 , 3 , 4 , 5 , 6 , or 7 are there ?
n0 = 4.0
n1 = 2.0
n2 = 3.0
n3 = 4.0
n4 = 5.0
n5 = 6.0
n6 = 7.0
t0 = n0 * n2
t1 = n0 * t0
answer = n0 * t1
print(answer)