variables:
    {G2} = 100
on rightclick holding a cyan shulker box:
    chance of 1/{G2}:
        execute console command "/menu grab %player% bow"
        set {G2} to 100
        send "&9>>> &c当選しました！おめでとうございます！"
        make player execute command "/summon fireworks_rocket ~ ~1 ~ {FireworksItem:{id:fireworks,Count:1,tag:{Fireworks:{Explosions:[{Type:0,Colors:[I;16753490],FadeColors:[I;15007580]}]}}}}"
        remove 1 cyan shulker box from player's inventory
    else:
        send "&9>>> &e残念、ハズレです。只今の当選確率%{G2}%はです"
        subtract 1 from {G2}
        remove 1 cyan shulker box from player's inventory