题解 | 挑7
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
import sys
def about7(x):
if x % 7 ==0:
return True
for i in str(x):
if i == '7':
return True
return False
n = int(input())
c = 0
for i in range(1,n+1):
if about7(i):
c +=1
print(c)
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