自守数
自守数
http://www.nowcoder.com/questionTerminal/88ddd31618f04514ae3a689e83f3ab8e
while True:
try:
n = int(input())
cnt = 0
for i in range(n):
if str(i * i).endswith(str(i)):
cnt += 1
print(cnt)
except:
break
