749A Bachgold Problem.cpp

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n%2==0)
    {
        cout<<n/2<<endl;
        for(int i=1;i<=n/2;i++)
        {
            cout<<2<<" ";
        }
        cout<<endl;
    }
    else
    {
        n=n-3;
        cout<<(n/2)+1<<endl;
        for(int i=1;i<=n/2;i++)
        {
            cout<<2<<" ";
        }
        cout<<3<<endl;
    }
    return 0;
}