1 import java.io.*;
2 import java.lang.*;
3 import java.text.*;
4 import java.util.*;
5 import java.math.*;
6 class Main
7 {
8 public static void main(String[] argc)
9 {
10 Scanner cin=new Scanner(System.in);
11 BigInteger a1,n,i;
12 while(cin.hasNextBigInteger())
13 {
14 a1=cin.nextBigInteger();
15 n=BigInteger.valueOf(1);
16 for(i=BigInteger.valueOf(1);i.compareTo(a1)<=0;i=i.add(BigInteger.valueOf(1)))
17 {
18 n=n.multiply(i);
19 }
20 System.out.println(n);
21 }
22 }
23 }
1 import java.util.*;
2 import java.math.*;
3 class Main
4 {
5 public static void main(String args[])
6 {
7 Scanner cin=new Scanner(System.in);
8 BigInteger a;
9 int n,i;
10 while(cin.hasNext())
11 {
12 n=cin.nextInt();
13 a=BigInteger.valueOf(1);
14 for(i=1;i<=n;i++)
15 {
16 a=a.multiply(BigInteger.valueOf(i));
17 }
18 System.out.println(a);
19 }
20 }
21 }
