1 #include<iostream>
 2 #include<algorithm>
 3 using namespace std;
 4 int main()
 5 {
 6     int   n,i,a[50];
 7     int temp,ans;
 8     while(~scanf("%d",&n))
 9       {
10           temp=0;
11           ans=-1;
12         for(i=0;i<n;i++)
13         {
14             scanf("%d",&a[i]);
15             if(i==0)
16                 ans=a[i];
17             else
18                 ans=ans^a[i];
19             if(a[i]>1)
20                  temp=1;
21         }
22         if(temp==0)
23         {
24             if(n%2==1)
25               printf("No\n");
26             else
27               printf("Yes\n");
28         }
29         else
30         {
31             if(ans==0)
32               printf("No\n");
33             else
34               printf("Yes\n");
35             
36         }
37     }
38     return 0;
39 }