def g;gets.split.map(&:to_i);end
n,k=g
e=(1..n).map{g}
m=(1..1502).map{[0]*1502}
k.times{
  x,y,w,h,d=g
  x+=500;y+=500
  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]*1502
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+500][x+500],0].max}.inject(:+)
#require'pp'
#pp m[490..510].map{|i|i[490..510]}