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'''
⚠️Challenge: how many odious numbers smaller than 10.000 can you find⚠️
odious numbers are non-negative numbers that have an odd number of ones in the binary expansion
# 21 = 10101 = 3
# 50 = 110010 = 3
Challenge: how many odious numbers smaller than 10.000 can you find?
'''
n=0
for i in range(10000):
if str(bin(i)).count('1')%2==1:
n+=1
print(n)
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OUTPUT
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