#include <iostream>

#define YES cout << "YES" << endl
#define NO cout << "NO" << endl

const int N = 2e5+10;

int a[N];

using namespace std;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n; cin >> n;
    for(int i = 1; i <= n; i ++) cin >> a[i];
    a[1] = a[1] % 2;

    for(int i = 2; i <= n; i ++)
    {
        if(a[i] < a[i - 1]) {NO; return 0;}

        a[i] = a[i] - a[i - 1], a[i] = a[i] % 2;
    }
    if(a[n]) NO;
    else YES;
    return 0;
}