java大数阶乘

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//JAVA 大数阶乘 
import java.math.*;
import java.util.Scanner;
 
public class LargeNumber{
    public static void main(String[] args){
        BigInteger ans = BigInteger.ONE;
        Scanner cin = new Scanner(System.in);
        int n = cin.nextInt();
        for(int i = 1; i <= n; i++){
            ans = ans.multiply(new BigInteger(i+""));
        }
        System.out.println(ans);
    }
 
}