def f(map1,cs,x,y,w,h)
	h2=map1[y][x]
	c2=cs[y][x]
	c2=h2 if c2==0
	c1=0
	[[0,1],[-1,0],[0,-1],[1,0]].each{|dy,dx|
		x2=x+dx
		y2=y+dy
		next if x2<0 || w<=x2 || y2<0 || h<=y2
		next if map1[y2][x2]<map1[y][x]
		c1+=1
		if cs[y2][x2]==0 then
			cs[y2][x2]=c2
		elsif 0<cs[y2][x2] && cs[y2][x2]!=cs[y][x]
			cs[y2][x2]=10**18
		end
	}
	if c1>0 then
		cs[y][x]=c2
	end
end
h,w=gets.split(" ").map{|e| e.to_i}
map1=[]
cs=[]
hs=[]
 
h.times{|y|
	map1<<gets.split(" ").map{|e| e.to_i}
	cs<<[]
	w.times{|x|
		t=map1[y][x]
		hs<<[t,y,x]
		cs[y]<<0
	}
}
hs.sort!
hs.each{|t,y,x|
 
	f(map1,cs,x,y,w,h)
}
ans=0
h.times{|y|
	w.times{|x|
	ans+=1 if cs[y][x]==10**18
	}
}
puts ans

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

MyAzCjIgOSA0CjcgNSAzCjYgMSA4

3 3
2 9 4
7 5 3
6 1 8