杭电oj 1001 java

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import java.util.Scanner;
class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner read = new Scanner(System.in);
        while(read.hasNextInt()) {
            int n = read.nextInt();
            if (n<0)
                continue;
            int sum = 0;
            for(int i = 1;i<=n;i++) {
                sum+=i;
            }
            System.out.println(sum);
            System.out.println();
        }    
        read.close();
    }
}