시간 제한 메모리 제한 제출 정답 맞은 사람 정답 비율
1 초 128 MB 22948 16568 14953 73.693%

## 문제

n이 주어졌을 때, 1부터 n까지 합을 구하는 프로그램을 작성하시오.

## 입력

첫째 줄에 n (1 ≤ n ≤ 10,000)이 주어진다.

1부터 n까지 합을 출력한다.

## 예제 입력 1

3


## 예제 출력 1

6

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