This is just one of many possible solutions:
number_of_dots = int(input('Please enter a number of dots less than or equal to 31: '))
if number_of_dots <= 31:
if number_of_dots >= 16:
number_of_dots = number_of_dots - 16
print('16')
if number_of_dots >= 8:
number_of_dots = number_of_dots - 8
print('8')
if number_of_dots >= 4:
number_of_dots = number_of_dots - 4
print('4')
if number_of_dots >= 2:
number_of_dots = number_of_dots - 2
print('2')
if number_of_dots >= 1:
number_of_dots = number_of_dots - 1
print('1')
else:
print('Please choose a number less than or equal to 31.')