题解 | #挑7#
挑7
http://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
while True:
try:
n = int(input())
num=0
for i in range(1,n+1):
str_i = str(i)
if i%7==0:
num+=1
elif '7' in str_i:
num+=1
print(num)
except:
break
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