def g;gets.split.map(&:to_i);end
n,k=g
e=(1..n).map{g}
t=(1..k).map{g}
xn=t.map{|x,_|x}.min
xx=t.map{|x,y,w,_|x+w}.max
yn=t.map{|x,y,_|y}.min
yx=t.map{|x,y,w,h,_|y+h}.max

m=(yn..yx+1).map{[0]*(xx-xn+1+1)}

t.each{|x,y,w,h,d|
  x-=xn;y-=yn
  m[y][x]+=d
  m[y][x+w+1]-=d
  m[y+h+1][x]-=d
  m[y+h+1][x+w+1]+=d
}
a=[0]*(xx-xn+1)
m.map!{|i|
  s=0
  a=a.zip(i.map{|j|s+=j}).map{|j,l|j+l}
}

p e.map{|x,y,h|[h-m[y-yn][x-xn],0].max}.inject(:+)