#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int b,c;
long a;
cout<<"Enter a nonnegative integer:";
cin>>a;
  c=a-1;
  for(b=c;b>0;b--)
  {
  a=a*b;

  }
  cout<<"The factorial is :"<<a;
getch();
}