3 last pivots

//@version=4
study("Lines Test 2", overlay = true)

pvtstr = input(3)

var line line1 = na
var line line2 = na
var line line3 = na

pvthi = pivothigh(high, pvtstr, pvtstr)
plot(pvthi, transp = 100)

if barstate.islast
    l = 1
    for i = 0 to 100
        if pvthi[i]
            if l == 1
                line.delete(line1)
                line1 := line.new(bar_index - i - pvtstr, high[i+pvtstr], bar_index, high[i+pvtstr])
            else
                if l == 2
                    line.delete(line2)
                    line2 := line.new(bar_index - i - pvtstr, high[i+pvtstr], bar_index, high[i+pvtstr])
                else
                    if l == 3
                        line.delete(line3)
                        line3 := line.new(bar_index - i - pvtstr, high[i+pvtstr], bar_index, high[i+pvtstr])
            l := l + 1
            if l > 3
                break