from collections import deque
from collections import defaultdict
from collections import Counter
from itertools import permutations

def main():
    N, M = map(int, input().split())
    A = tuple(map(int, input().split()))
    UV = tuple(tuple(map(int, input().split())) for _ in [0] * M)

    a = dict()
    for i, j in enumerate(A):
        a[i+1] = j

    edge = [[0 for _ in [0] * (N + 1)] for _ in [0] * (N + 1)]
    for u, v in UV:
        edge[u][v] = edge[v][u] = 1

    for i in range(1, N + 1):
        for j in range(1, N + 1):
            for k in range(1, N + 1):
                if a[i] != a[k]:
                    if a[i] < a[j] > a[k] or a[i] > a[j] < a[k]:
                        print('YES')
                        return
    print('NO')

main()