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	`1`	`+import java.util.Scanner;`
	`2`	`+`
	`3`	`+// Write a function that calculates the factorial of a given number.🚀`
	`4`	`+public class challenge18 {`
	`5`	`+ public static void main(String[] args) {`
	`6`	`+ Scanner sc = new Scanner(System.in);`
	`7`	`+ System.out.println("Welcome to factorial");`
	`8`	`+ System.out.print("Enter the number: ");`
	`9`	`+ int num = sc.nextInt();`
	`10`	`+ long fact = factorial(num);`
	`11`	`+ System.out.println("Factorial is: " + fact);`
	`12`	`+ }`
	`13`	`+`
	`14`	`+ public static long factorial(int num){`
	`15`	`+ if (num < 2){`
	`16`	`+ return 1;`
	`17`	`+ }`
	`18`	`+ long fact = 1;`
	`19`	`+ int i = 2;`
	`20`	`+ while(i <= num){`
	`21`	`+ fact *= i;`
	`22`	`+ i++;`
	`23`	`+ }`
	`24`	`+ return fact;`
	`25`	`+ }`
	`26`	`+}`

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