1 #include<cstdio>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     int i,n,digit,temp,carry,j;
 7     int a[40005];
 8     while(scanf("%d",&n)!=EOF)
 9     {
10         a[0]=1;
11         digit=0;
12         for(i=2;i<=n;i++)
13         {
14             for(carry=0,j=0;j<=digit;j++)
15             {
16                 temp=a[j]*i+carry;
17                 a[j]=temp%10;
18                 carry=temp/10;
19             }
20             while(carry)
21             {
22                 a[++digit]=carry%10;
23                 carry/=10;
24             }
25         }
26         for(i=digit;i>=0;i--)
27         printf("%d",a[i]);
28         printf("\n");
29     }
30     return 0;
31 }