//Factorial problem
//Author: Kazi Masum
#include<iostream>
#include<cmath>

using namespace std;

int main()
{

int n, i=1;
int factorial=1;
cout<<"Enter the value of n="<<endl;
cin>>n;


while(i<=n)

{

factorial=factorial*i;

i++;


}
cout<<"factorial of n="<< factorial<< endl;

return 0;
}