Conditional Statements : My code is having some trouble on specific input

using namespace std;

int main(){ int N; cin >> N;

if (N%2==1 ) 
{   cout << "Weird"             ;   
}
else if  (2<= N <= 5 && N%2==0)
{    cout  << "Not Weird"       ; 
}

else  if ( 6 <= N <= 20 && N%2==0  )  
{   cout << "Weird"             ;
}

    else if  (N >= 20 && N%2==0)
{   cout << "Not Weird" ; }
return 0;

}

This code is printing Not Weird on input of 18.
But it should print Weird I can't figure out where is problem. By the way I am newbie in coding now. So , Please try to explain the solution. Thanks