Started for Array

int [] y = {
  500, 400, 300
};

int [] x = {
  100, 200, 300
};

int [] R = {
  255, 153, 0
};

int [] G = {
  0, 255, 51
};

int [] B = {
  153, 0, 255
};

void setup() {
  size(400, 400);
}
void draw() {
  background(255);
  for (int i=0; i<y.length; i++) {
    fill (R[i], G[i], B[i]);
    draw_balloon(x[i], y[i], 50);
    y[i]=y[i]-1;
    if (y[i] <= 0) {
      y[i] = height;
    }
  }
}
void draw_balloon(int x, int y, int z) {
  line(x, y, x, y+50);
  ellipse(x, y, z, z);
}