题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
import sys
n = int(sys.stdin.readline().strip())
count = 0
for num in range(1, n+1):
num2str = str(num)
if num%7 == 0 or '7' in num2str:
count += 1
print(count)
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