#pragma comment(linker, "/STACK:1024000000,1024000000")#include<cstdio>#include<cstring>#include<cmath>#include<algorithm>#include<vector>#include<map>#include<set>#include<queue>#include<stack>#include<ctime>#include<iostream>using namespace std;typedef long long LL;const double pi=acos(-1.0),eps=1e-10;void File(){    freopen("D:\\in.txt","r",stdin);    freopen("D:\\out.txt","w",stdout);}template <class T>inline void read(T &x){    char c = getchar();    x = 0;    while(!isdigit(c)) c = getchar();    while(isdigit(c))    {        x = x * 10 + c - ‘0‘;        c = getchar();    }}int a[200010],n;int main(){    cin>>n;    for(int i=1;i<=n;i++) cin>>a[i];    bool fail=0;    for(int i=1;i<n;i++)    {        if(a[i]<0) fail=1;        a[i]=a[i]%2;        if(a[i]==1)        {            a[i]--;            a[i+1]--;        }    }    a[n]=a[n]%2;    if(a[n]!=0) fail=1;    if(fail==1) printf("NO\n");    else printf("YES\n");    return 0;}