import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;
import java.util.ArrayList;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(1, in, out);
        out.close();
    }

    static class Task {
        static boolean search(ArrayList<Task.Vertex> path) {
            if (path.size() == 3) {
                int v0 = path.get(0).getValue();
                int v1 = path.get(1).getValue();
                int v2 = path.get(2).getValue();
                return (v0 != v1 && v1 != v2 && v2 != v0) && ((v1 < v0 && v1 < v2) || (v1 > v0 && v1 > v2));
            }

            Task.Vertex v = path.get(path.size() - 1);
            for (int i = 0; i < v.getDegree(); i++) {
                ArrayList<Task.Vertex> next = new ArrayList<>();
                next.addAll(path);
                next.add(v.getEdge(i).getVertex());
                if (search(next)) {
                    return true;
                }
            }
            return false;
        }

        public void solve(int testNumber, Scanner in, PrintWriter out) {
            final int n = in.nextInt();
            final int m = in.nextInt();

            Task.Vertex[] v = new Task.Vertex[n];
            for (int i = 0; i < n; i++) {
                v[i] = new Task.Vertex(in.nextInt());
            }
            for (int i = 0; i < m; i++) {
                int index1 = in.nextInt() - 1;
                int index2 = in.nextInt() - 1;
                v[index1].setEdge(v[index2]);
                v[index2].setEdge(v[index1]);
            }

            boolean exist = false;
            for (int i = 0; i < n; i++) {
                ArrayList<Task.Vertex> path = new ArrayList<>();
                path.add(v[i]);
                if (search(path)) {
                    exist = true;
                    break;
                }
            }

            out.printf("%s", exist ? "YES" : "NO");
        }

        static class Vertex {
            private int value;
            private ArrayList<Task.Edge> edges = new ArrayList<Task.Edge>();

            Vertex() {
            }

            Vertex(int v) {
                this.value = v;
            }

            void setEdge(Task.Vertex v) {
                this.edges.add(new Task.Edge(v));
            }

            int getValue() {
                return this.value;
            }

            int getDegree() {
                return this.edges.size();
            }

            Task.Edge getEdge(int index) {
                return this.edges.get(index);
            }

        }

        static class Edge {
            private Task.Vertex v;
            private int cost;

            Edge() {
                this.v = v;
            }

            Edge(Task.Vertex v) {
                this.v = v;
            }

            Edge(Task.Vertex v, int c) {
                this.v = v;
                this.cost = c;
            }

            Task.Vertex getVertex() {
                return this.v;
            }

        }

    }
}