variables:
    {safeloce} = 10

command /radiation safe <number>:
    trigger:
        set {safeloce} to arg 1
        set {srodekr} to location of player

on player move:
    if distance between the player and {srodekr} is bigger than {safeloce}:
        create bossbar titled "&cRadiacja" and id "radiacja" for player with progress 100 with colors red
        apply potion of wither of tier 3 to player for 3 second
    if distance between the player and {srodekr} is smaller than {safeloce}:
        remove bossbar "radiacja"
        wait 3 seconds
        remove wither from player