#include <cstdio>
#define maxn 500000

int n;
int a[maxn + 5];

int main()
{
	scanf("%d", &n);
	for (int i = 1; i <= n; ++i)
		scanf("%d", &a[i]);
	bool ans = true;
	if (n == 2)
		ans = (a[1] - a[2]) % 2 == 0;
	else
	{
		for (int i = 1; i <= n; ++i)
			if ((a[i + 1] - a[i]) % (n - 2) != 0)
				ans = false;
	}
	if (ans)
		puts("Yes");
	else
		puts("No");
	return 0;
}