Donut Shop

시간 제한1초메모리 제한2048 MB

요약
도넛 개수를 갱신하면서 굽기 이벤트는 더하고 판매 이벤트는 빼서 영업이 끝난 뒤 남은 도넛 수를 출력한다.
난이도

쉬움10점 중 1점

유형
시뮬레이션, 구현
정답자
아직 제출이 없습니다

문제

The owner of a donut shop spends the day baking and selling donuts.

Given the events that happen over the course of the day, your job is to determine the number of donuts remaining when the shop closes.

입력

The first line of input contains a non-negative integer, DD, representing the number of donuts available when the shop first opens.

The second line contains a positive integer, EE, representing the number of events that happen over the course of the day. The next EE pairs of input lines describe these events.

The first line in the pair contains either the + (plus) symbol, indicating that donuts have been baked, or the - (minus) symbol, indicating that donuts have been sold. The second line in the pair contains a positive integer, QQ, representing the quantity of donuts associated with the event.

For each sale of donuts, the value of QQ will be less than or equal to the number of donuts available at that time.

출력

Output the non-negative integer, RR, which is the number of donuts remaining when the shop closes.

예제1

  1. 예제 1

    입력
    10
3
+
24
-
6
-
12
    예상 출력
    16