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solve the problem

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	`1`	`+import java.io.*;`
	`2`	`+import java.util.*;`
	`3`	`+import java.text.*;`
	`4`	`+import java.math.*;`
	`5`	`+import java.util.regex.*;`
	`6`	`+`
	`7`	`+public class Solution {`
	`8`	`+`
	`9`	`+ static int factorial(int n) {`
	`10`	`+ if(n <= 1) {`
	`11`	`+ return n;`
	`12`	`+ }`
	`13`	`+ return n * factorial(n - 1);`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ public static void main(String[] args) {`
	`17`	`+ Scanner in = new Scanner(System.in);`
	`18`	`+ int n = in.nextInt();`
	`19`	`+ int result = factorial(n);`
	`20`	`+ System.out.println(result);`
	`21`	`+ }`
	`22`	`+}`

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	`1`	`+https://www.hackerrank.com/challenges/30-recursion/problem`

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