문제
7:00부터 19:00까지 전화 요금은 1분에 10원이다.
19:00부터 7:00까지 전화 요금은 1분에 5원이다.
상근이가 전화를 건 시간과 통화 시간이 모두 주어졌을 때, 전화 요금을 구하는 프로그램을 작성하시오.
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