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/// palindrom array

#include <stdio.h>
int main()
{
    int n, b, flag = 1, temp = 0;
    scanf("%d", &n);

    int a[n], raw[n];
    for (int i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
        raw[i] = a[i];
    }
    for (int i = 0; i <= (n - 1) / 2; i++)
    {
        temp = a[i];
        a[i] = a[n - 1 - i];
        a[n - 1 - i] = temp;
    }
    if (1)
    {
        for (int i = 0; i < n; i++)
        {
            if (raw[i] != a[i])
            {
                printf("NO\n");
                break;
            }
        }
    }
    else
    {
        printf("YES\n");
    }
    
    return 0;
}