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