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											//计算1!+2!+....n!
import java.util.Scanner;
public class MiCi {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("请输入n的值:");//n为正整数
        int n=in.nextInt();
        int sum=0;
        int number=1;
        for(int j=1;j<=n;j++){
    
            number=number*j;
            sum=sum+number;
        }
        System.out.println("计算结果为:"+sum);
    } 
}