import sys
import io, os
sys.setrecursionlimit(10**9)
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

n, m = map(int, input().split())
LR0 = []
LR1 = []
for i in range(n):
    l, r = map(int, input().split())
    LR0.append((l, r))
    LR1.append((m-1-r, m-1-l))

g = [[] for i in range(2*n)]
rg = [[] for i in range(2*n)]

for i in range(n-1):
    for j in range(i+1, n):
        li0, ri0 = LR0[i]
        li1, ri1 = LR1[i]
        lj0, rj0 = LR0[j]
        lj1, rj1 = LR1[j]
        # 区間がかぶる場合を考える
        cnt = 0
        if min(ri0, rj0) >= max(li0, lj0):
            # ¬xi ∨ ¬xj
            # xi ⇒ ¬xj, xj ⇒ ¬xi
            g[i].append(n+j)
            rg[n+j].append(i)
            g[j].append(n+i)
            rg[n+i].append(j)
            cnt += 1
        if min(ri0, rj1) >= max(li0, lj1):
            # ¬xi ∨ xj
            # xi ⇒ xj, ¬xj ⇒ ¬xi
            g[i].append(j)
            rg[j].append(i)
            g[n+j].append(n+i)
            rg[n+i].append(n+j)
        if min(ri1, rj0) >= max(li1, lj0):
            # xi ∨ ¬xj
            # ¬xi ⇒ ¬xj, xj ⇒ xi
            g[n+i].append(n+j)
            rg[n+j].append(n+i)
            g[j].append(i)
            rg[i].append(j)
            cnt += 1
        if min(ri1, rj1) >= max(li1, lj1):
            # xi ∨ xj
            # ¬xi ⇒ xj, ¬xj ⇒ xi
            g[n+i].append(j)
            rg[j].append(n+i)
            g[n+j].append(i)
            rg[i].append(n+j)
            cnt += 1
        if cnt == 4:
            print('NO')
            exit()

def dfs(v):
    used[v] = True
    for u in g[v]:
        if not used[u]:
            dfs(u)
    vs.append(v)

def rdfs(v, k):
    used[v] = True
    cmp[v] = k
    for u in rg[v]:
        if not used[u]:
            rdfs(u, k)

vs = []
cmp = [-1]*(2*n)

used = [False]*(2*n)
for v in range(2*n):
    if not used[v]:
        dfs(v)

k = 0
used = [False]*(2*n)
for v in reversed(vs):
    if not used[v]:
        k += 1
        rdfs(v, k)

for i in range(n):
    if cmp[i] == cmp[n+i]:
        print('NO')
        exit()
print('YES')