int x,x2,x3,x4,x5,x6;
void setup(){
  size(600,200);  
  noFill();
}
void draw(){
  background(230);
  x=mouseX;
  x2=x*2;
  x3=x*3;
  x4=x*4;
  x5=x*5;
  x6=x*6;
  line(x,0,x,200);
  line(x2,0,x2,200);
  line(x3,0,x3,200);
  line(x4,0,x4,200);
  line(x5,0,x5,200);
  line(x6,0,x6,200);
}