18108 입력값에 조건 주기

phython

a=0
while(a==0):
    b = int(input())
    if b < 1000 or b > 3000:
        print("잘못입력")  
    else:
        print(b-543)
        a=1

**들여쓰기 주의하자

 

if문

https://wikidocs.net/20#and-or-not

type 변환

https://codechacha.com/ko/python-convert-string-to-integer/