阶乘计算

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int[] value = new int[9999];
		value[0] = 1;
		for (int i = 1; i <= n; i++) {
			for (int j = 0; j < value.length-1; j++) {
				value[j] = value[j] * i;
			}
			for (int j = 0; j < value.length-1; j++) {
				value[j+1] = value[j+1] + (value[j]/10);
				value[j] = value[j] % 10;
			}
		}
		int index = 0;
		for (int i = value.length-1; i >= 0; i--) {
			if(value[i] != 0) {
				index = i;
				break;
			}
		}
		for (int i = index; i >= 0; i--) {
			System.out.print(value[i]);
		}
	}
}