Yellow Dots at 20th, 60th, 120th Last Close

//version=6
indicator("Yellow Dots at 20th, 60th, 120th Last Close", overlay=true)

var label dotLabel20 = na
var label dotLabel60 = na
var label dotLabel120 = na

if barstate.islast
if na(dotLabel20)
dotLabel20 := label.new(bar_index[19], close[19], "⬤", color=color.new(color.white, 100), textcolor=color.yellow, size=size.tiny)
else
label.set_x(dotLabel20, bar_index[19])
label.set_y(dotLabel20, close[19])

if na(dotLabel60)
dotLabel60 := label.new(bar_index[59], close[59], "⬤", color=color.new(color.white, 100), textcolor=color.yellow, size=size.tiny)
else
label.set_x(dotLabel60, bar_index[59])
label.set_y(dotLabel60, close[59])

if na(dotLabel120)
dotLabel120 := label.new(bar_index[119], close[119], "⬤", color=color.new(color.white, 100), textcolor=color.yellow, size=size.tiny)
else
label.set_x(dotLabel120, bar_index[119])
label.set_y(dotLabel120, close[119])