Logan.
2021. 3. 21. 16:33
import java.util.Scanner;
class Practice{
public static void main(String[]args) {
Scanner scan= new Scanner(System.in);
int lim = scan.nextInt();
int sum=0;
for(int i =1; i <= lim; i++){
sum += i;
}
System.out.println(sum);
}
}