#include <stdio.h>
int main(){
int n;
scanf("%d",&n);
int i,result=1;
for(i=1;i<=n;i++)
{
result*=i;
}
printf("%d\n",result);
return 0;
}
#include <stdio.h>
int main(){
int n;
scanf("%d",&n);
int i,result=1;
for(i=1;i<=n;i++)
{
result*=i;
}
printf("%d\n",result);
return 0;
}