题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
n = int(input())
num = []
for i in range(1, n+1):
num.append(i)
num_7 = []
for i in num:
if i % 7 == 0:
num_7.append(i)
for i in num:
for j in range(len(str(i))):
if str(i)[j] == '7' and i not in num_7:
num_7.append(i)
print(len(num_7))
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