1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 
 5 using namespace std;
 6 int num[80000];
 7 int main ()
 8 {
 9     int n,pre;
10     while (~scanf("%d",&n))
11     {
12         memset(num,0,sizeof(num));
13         num[0]=1;
14         int len=1;
15         for (int i=2; i<=n; i++)
16         {
17             pre=0;
18             for (int j=0; j<len; j++)
19             {
20                 num[j]=num[j]*i+pre/10;
21                 pre=num[j];
22                 num[j]=num[j]%10;
23             }
24             while (pre>9)
25             {
26                 num[len]=pre/10%10;
27                 len++;
28                 pre/=10;
29             }
30         }
31         for (int i=len-1; i>=0; i--)
32             printf ("%d",num[i]);
33         printf ("\n");
34     }
35     return 0;
36 }