n, x = map(int, input().split())
C = list(map(int, input().split()))

neg, zero, pos = False, False, False
for i in range(n):
    C[i] -= x
    if C[i] > 0:
        pos = True
    elif C[i] < 0:
        neg = True
    else:
        zero = True
if zero or (pos and neg):
    print("Yes")
else:
    print("No")