#include<iostream>
using namespace std;
unsigned long factorial(unsigned long);
int main()
{
int math;
while(cin>>math)
{
cout<<factorial(math)<<endl;
}
return 0;
}
unsigned long factorial(unsigned long number)
{
if(number<=1)
return 1;
return number*factorial(number-1);
}
#include
using namespace std;
unsigned long factorial(unsigned long);
int main()
{
int math;
while(cin>>math)
{
cout<<
}
return 0;
}
unsigned long factorial(unsigned long number)
{
if(number<=1)
return 1;
return number*factorial(number-1);
}
減到最後 number 都會變成 1