const
        dir=4;
        dx:array [1..dir] of longint=(1,-1,0,0);
        dy:array [1..dir] of longint=(0,0,1,-1);
var
        m,n,k,i,j,l,x,y,ans,lt,rt:longint;
        dl,dr:array [0..32,0..32] of longint;
        vl,vr:array [0..32,0..32] of boolean;
        plx,ply,prx,pry:array [1..1024] of longint;
        a:array [0..1024,0..1024] of boolean;
        v:array [0..1024] of boolean;
        p:array [0..1024] of longint;
function tonode(x,y:longint):longint;
begin
        if (x+y) and 1=0 then begin
          if vl[x,y] then exit(dl[x,y]);
          vl[x,y]:=true;
          inc(lt);dl[x,y]:=lt;
          exit(lt);
        end
        else begin
          if vr[x,y] then exit(dr[x,y]);
          vr[x,y]:=true;
          inc(rt);dr[x,y]:=rt;
          exit(rt);
        end;
end;
function find(h:longint):boolean;
var
        i:longint;
begin
        for i:=1 to rt do
          if (a[h,i])and(not v[i]) then
          begin
            v[i]:=true;
            if (p[i]=0)or(find(p[i])) then
            begin
              p[i]:=h;
              exit(true);
            end;
          end;
        exit(false);
end;

begin
        open('input.txt','output.txt');
        readln(m,n,k);
        for i:=1 to m do
          for j:=1 to n do
            if (i+j)and 1=0 then begin
              for l:=1 to dir do
                if (1<=i+dx[l])and(i+dx[l]<=m)and
                   (1<=j+dy[l])and(j+dy[l]<=n)
                then a[tonode(i,j),tonode(i+dx[l],j+dy[l])]:=true;
            end;
        for i:=1 to k do
        begin
          readln(y,x);
          for l:=1 to dir do
            if (1<=x+dx[l])and(x+dx[l]<=m)and
               (1<=y+dy[l])and(y+dy[l]<=n)
            then begin
              if (x+y) and 1=0 then a[tonode(x,y),tonode(x+dx[l],y+dy[l])]:=false
              else a[tonode(x+dx[l],y+dy[l]),tonode(x,y)]:=false;
            end;
        end;
        for i:=1 to lt do
        begin
          fillchar(v,sizeof(v),false);
          if find(i) then inc(ans);
        end;
        if ans*2+k=m*n then writeln('YES')
        else writeln('NO');
        endpro;
end.