tri:=File("triangle.txt").pump(List,fcn(s){ s.strip().split(" ").apply("toInt") }).copy();
while(tri.len()>1){
   t0:=tri.pop();
   t1:=tri.pop();
   tri.append( [[(it); t1.enumerate();
	'wrap([(i,t)]){ t + t0[i].max(t0[i+1]) }]])
}
tri[0][0].println();