Snuke is playing a puzzle game. In this game, you are given a rectangular board of dimensions R × C, filled with numbers. Each integer i from 1 through N is written twice, at the coordinates (x_{i,1},y_{i,1}) and (x_{i,2},y_{i,2}).

The objective is to draw a curve connecting the pair of points where the same integer is written, for every integer from 1 through N. Here, the curves may not go outside the board or cross each other.

Determine whether this is possible.

Constraints

* 1 ≤ R,C ≤ 10^8
* 1 ≤ N ≤ 10^5
* 0 ≤ x_{i,1},x_{i,2} ≤ R(1 ≤ i ≤ N)
* 0 ≤ y_{i,1},y_{i,2} ≤ C(1 ≤ i ≤ N)
* All given points are distinct.
* All input values are integers.

Input

Input is given from Standard Input in the following format:


R C N
x_{1,1} y_{1,1} x_{1,2} y_{1,2}
:
x_{N,1} y_{N,1} x_{N,2} y_{N,2}


Output

Print `YES` if the objective is achievable; print `NO` otherwise.

Examples

Input

4 2 3
0 1 3 1
1 1 4 1
2 0 2 2


Output

YES


Input

2 2 4
0 0 2 2
2 0 0 1
0 2 1 2
1 1 2 1


Output

NO


Input

5 5 7
0 0 2 4
2 3 4 5
3 5 5 2
5 5 5 4
0 3 5 1
2 2 4 4
0 5 4 1


Output

YES


Input

1 1 2
0 0 1 1
1 0 0 1


Output

NO
R,C,n=map(int,raw_input().split())
pair=[map(int,raw_input().split()) for _ in xrange(n)]
u=[]
r=[]
d=[]
l=[]
for i in xrange(n):
    x1,y1,x2,y2=pair[i]
    if 0<x1<R and 0<y1<C:continue
    if 0<x2<R and 0<y2<C:continue
    if x1==0:
        u.append([y1,i])
    if x1==R:
        d.append([y1,i])
    if y1==0:
        if x1!=0 and x1!=R:
            l.append([x1,i])
    if y1==C:
        if x1!=0 and x1!=R:
            r.append([x1,i])
    if x2==0:
        u.append([y2,i])
    if x2==R:
        d.append([y2,i])
    if y2==0:
        if x2!=0 and x2!=R:
            l.append([x2,i])
    if y2==C:
        if x2!=0 and x2!=R:
            r.append([x2,i])
u.sort()
r.sort()
d.sort(reverse=True)
l.sort(reverse=True)
urdl=u+r+d+l
stack=[]
for i in xrange(len(urdl)):
    if len(stack)==0:
        stack.append(urdl[i][1])
    elif stack[-1]==urdl[i][1]:
        stack.pop()
    else:
        stack.append(urdl[i][1])
print "YES" if len(stack)==0 else "NO"
