mi=math.min
n,v,l=io.read("*n","*n","*n")
f=2^44
d={} for i=0,v do d[i]=0 end
p=0
for i=1,n+1 do
  if n<i then x,z,w=l,0,0 else x,z,w=io.read("*n","*n","*n") end
  y=x-p
  for j=y,v do d[j-y]=d[j] end
  for j=math.max(0,v+1-y),v do d[j]=f end
  for j=v,0,-1 do q=mi(v,j+z) d[q]=mi(d[q],d[j]+w) end
  p=x
end
r=f
for i=0,v do r=mi(r,d[i]) end
print(r<f and r or -1)