1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 
 5 using namespace std;
 6 
 7 #define ll long long
 8 
 9 int num[80000];
10 
11 int main()
12 {
13     int n;
14     while(~scanf("%d",&n))
15     {
16         memset(num,0,sizeof(num));
17         num[0]=1;
18         int pre=0;
19         int len=1;
20         for(int i=2;i<=n;i++)
21         {
22             pre=0;
23             for(int j=0;j<len;j++)
24             {
25                 num[j]=num[j]*i+pre/10;
26                 pre=num[j];
27                 num[j]%=10;
28             }
29             while(pre>9)
30             {
31                 num[len]=pre/10%10;
32                 len++;
33                 pre/=10;
34             }
35         }
36         for(int i=len-1;i>=0;i--)
37         printf("%d",num[i]);
38         printf("\n");
39     }
40     return 0;
41 }