题解 | #挑7#
挑7
http://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
import sys
while True:
try:
N = int(input()) + 1
count = 0
for i in range(1,N):
#直接判断是否整除7或者包含7
if i % 7 == 0 or '7' in str(i):
count += 1
print(count)
except:
break
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