n=gets
l=$<.map{|s|s.split.map &:to_i}.sort_by{|e|-e[2]}
m=t=0;l.map{|e|t+=e[-1]}
d=[*(0...n.to_i)]
d.permutation.map{|a|
h=Hash[a.zip(d)]
s=t;l.all?{|e|x,y,v=*e;h[y]<h[x]&&s-=v;s>m};m<s&&(m=s)
}
p m