给定一个整数N，编写程序求1！+2！+……+N！

[java]代码库

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int N = input.nextInt();
		long sum = 0, num;
		int i, j;
		
		for(i = 1; i <= N; i++)
		{
			num = 1;
			for(j = 1; j <= i; j++)
			{
				num = num * j;
			}
			sum += num;
		}
		
		System.out.print(sum);
		
		input.close();
	}
}