J01002_TinhTongNSoNguyenDuongDauTien.java

import java.io.File;
import java.util.*;

public class J01002_TinhTongNSoNguyenDuongDauTien {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while (t-- > 0) {
            long n = sc.nextLong();
            System.out.println(n * (n + 1) / 2);
        }
    }
}