import sys
read=sys.stdin.buffer.read
readline=sys.stdin.buffer.readline
readlines=sys.stdin.buffer.readlines

n, m=map(int, readline().split())
lr=list(map(int, read().split()))
ls=lr[::2]
rs=lr[1::2]
for i in range(n):
    if m-1-rs[i]<ls[i]:
        ls[i], rs[i]=m-1-rs[i], m-1-ls[i]
lrs=sorted(list(zip(ls, rs)))
x1, x2=-1, -1
for l, r in lrs:
    if x1<l and x2<l:
        if x1<x2:
            x2=r
        else:
            x1=r
    elif x1<l:
        x1=r
    elif x2<l:
        x2=r
    else:
        print("NO")
        exit()
if x1+x2+2<=m:
    print("YES")
else:
    print("NO")