#include<stdio.h>
int main()
{
	int n, m;
	scanf("%d %d", &n, &m);
	int i, j, k;
	int a[1003];
	for (i = 0; i < n; i++)
		scanf("%d", &a[i]);
	int u, v;
	int d[1003][1003];
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			d[i][j] = 0;
	for (i = 0; i < m; i++)
	{
		scanf("%d %d", &u, &v);
		d[u - 1][v - 1] = d[v - 1][u - 1] = 1;
	}
	int f = 0;
	for (i = 0; i < n; i++)
	{
		for (j = i + 1; j < n; j++)
		{
			for (k = j + 1; k < n; k++)
			{
				if (a[k] == a[i])
					continue;
				if (a[i]<a[j] && a[j]>a[k])
					f++;
				if (a[i] > a[j] && a[j] < a[k])
					f++;
			}
		}
	}
	if (f > 0)
		printf("YES\n");
	else
		printf("NO\n");
	return 0;
}