31 lines
713 B
Java
31 lines
713 B
Java
/*
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* Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
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* Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
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*/
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package test;
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import java.util.Scanner;
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/**
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*
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* @author hoang
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*/
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public class Test {
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/**
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* @param args the command line arguments
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*/
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public static void main(String[] args) {
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Scanner reader = new Scanner(System.in);
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long n = reader.nextLong();
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long ans = 0;
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long[] f = new long[22];
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f[0]=1;
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for(int i=1; i<=n ; i++){
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f[i]=f[i-1]*i;
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ans+=f[i];
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}
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System.out.print(ans);
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reader.close();
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}
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}
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