#include <iostream.h>
#include <conio.h>
int fact(int n)
{
int i,f;
f=1;
i=1;
for(i=1;i<=n;++i)
f=f*i;
return(f);
}
int main()
{
int n;
cout<<"Enter Your Number"<<endl;
cin>>n;
cout<<fact(n);
return 0;
}