python 挑7
（练习用）挑7
http://www.nowcoder.com/questionTerminal/ba241b85371c409ea01ac0aa1a8d957b
while True:
try:
num = int(input())
count = 0
for x in range(num):
if ('7' in str(x+1)) or ((x+1) %7==0):
count += 1
print(count)
except:
pass
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