Codeup 1270 : 1의 개수는? 1

https://codeup.kr/problem.php?id=1270

 

1270 : 1의 개수는? 1

n = int(input())
count = 0

for i in range(1, n+1):
    if i % 10 == 1:
        count += 1

print(count)