[백준] 8393번 : 합 - Kotlin(코틀린)

https://www.acmicpc.net/problem/8393

import java.util.*;
fun main(args: Array<String>) {
    val s=Scanner(System.`in`)
    var n=s.nextInt()
    var sum=0
    if(n%2==1){
        var m=(n+1)/2
        sum=(1+n)*(n/2)+m
    }
    else sum=(1+n)*((n+1)/2)
    print(sum)
}