vernrimpdiv

#include <iostream>
using namespace std;

int main()
{
    int n;
    cin>>n;
    if(n==1)
        cout<<"da\n";
    else
    {
        int nrd=2,d=2;
        while(d*d<n)
        {
            if(n%d==0)
                nrd+=2;
            ++d;
        }
        if(d*d==n)
            ++nrd;
        if(nrd%2)
            cout<<"da\n";
        else
            cout<<"nu\n";
    }
    return 0;
}