on rightclick on a furnace:
    if {piec.%event-block%} is false:
        cancel event
        if player is holding a iron ore named "&3Ruda Stali" with lore " ||&6Opis:|| &7Troche ciezkie! Przepal to w piecu!":
            open chest with 1 rows named "&5Piec" to player           
            set {przepalanie.%player%} to 1
            wait 5 tick
            if {przepalanie.%player%} is 1:
                format slot 0 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                wait 5 tick
                if {przepalanie.%player%} is 1:
                    format slot 1 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                    wait 5 tick
                    if {przepalanie.%player%} is 1:
                        format slot 2 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                        wait 5 tick
                        if {przepalanie.%player%} is 1:
                            format slot 3 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                            wait 5 tick
                            if {przepalanie.%player%} is 1:
                                format slot 4 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                                wait 5 tick
                                if {przepalanie.%player%} is 1:
                                    format slot 5 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                                    wait 5 tick
                                    if {przepalanie.%player%} is 1:
                                        format slot 6 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                                        wait 5 tick
                                        if {przepalanie.%player%} is 1:
                                            format slot 7 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                                            wait 5 tick
                                            if {przepalanie.%player%} is 1:
                                                format slot 8 of the player with 1 of red wool named "&cPrzepalanie" to be unstealable
                                                wait 5 tick
                                                open chest with 1 rows named "&3Odbierz Stal" to the player
                                                if {przepalanie.%player%} is 1:
                                                    wait 5 tick
                                                    format slot 4 of the player with 1 of iron bar named "&3Stal" to close then run "mythicmobs item give %player% Stal"