#include <bits/stdc++.h>
using namespace std;
int N, a[101];
int main(){
    freopen(".10.in","r",stdin);
    freopen(".10.out","w",stdout);
    int i;
    cin>>N;
    for(i=0; i<N; i++) cin>>a[i];
    if(N % 2 == 0) cout<<"No";
    else {
        if(a[0] % 2 == 1 && a[N-1] % 2 == 1) cout<<"Yes";
        else cout<<"No";
    }
}