facto

#include <iostream>

using namespace std;

int main ()
{
   unsigned n,k=1,x,p,ok=0;

  cout<<"n=";cin>>n;

  while (k<n&&!ok)
  {
      p=1;
      for (x=1;x<=k;x++)
          p*=x;

      if (p==n)
        ok=1;
      else
      k++;
  }

  if (ok)
    cout<<"DA"<<endl<<k;
  else
    cout<<"NU";

    return 0;
}