import sys
input = sys.stdin.readline

N, M = map(int, input().split())
a = list(map(int, input().split()))
adj_list = [[] for _ in range(N)]

for _ in range(M):
    ui, vi = map(int, input().split())
    adj_list[ui-1].append(vi-1)
    adj_list[vi-1].append(ui-1)

for i in range(N):
    for j in range(len(adj_list[i])):
        for k in range(len(adj_list[i])):
            if j == k:
                continue
            l = [a[adj_list[i][j]], a[i], a[adj_list[i][k]]]
            
            if len(set(l)) == 3 and a[i] in [max(l), min(l)]:
                print('YES')
                exit()

print('NO')