ex95

#include<iomanip>
#include<cmath>
#include<iostream>
using namespace std;
int main()
{
    int n,fact=1;
    cin>>n;
    while(fact<n)
      {
       fact=fact*n;
       fact++;
      }
         if(n==fact)  cout<<" da"<<" "<<fact-1;
           else cout<"nu";

}