include

using namespace std; int main() {

int n;
long long a=2,b=1,m=0;
cin>>n;
while(m<n)
{
	if(m==n-1)
	{
		if(n%2==0)
		{
			cout<<b<<endl;
			break;
		}
		else
		{
			cout<<a<<endl;
			break;
		}
	}
	else
	{
	    cout<<a<<" ";
	    a+=2;
	    m+=1;
	    cout<<b<<" ";
	    b+=2;
	    m+=1;
	}
}
return 0;

}