package com.itranswarp.learnjava;
import java.util.Scanner;

/**
 * while练习
 */
public class Main {

	public static void main(String[] args) {
		int sum = 0;

		Scanner scanner = new Scanner(System.in);
		System.out.print("请输入m：");
		int m = scanner.nextInt();
		System.out.print("请输入n：");
		int n = scanner.nextInt();
		// FIXME: 使用while计算M+...+N:
		int i = 0;
		while (i<=(n-m)) {
			sum += m;
			m++;
		}
		System.out.println(sum);
	}

}