on right click:
    if name of held item contains "&d弾ガチャ":
        remove 1 of player's held item from the player's inventory
        set {_random} to a random integer between 1 and 100
        if {_random} equals 1:
            execute console command "scoreboard players add %player% bullet 10"
            message "&1>>> &e弾の数が１０増えた！"
        else if {_random} is between 2 and 4:
            execute console command "scoreboard players add %player% bullet 5"
            message "&1>>> &e弾の数が５増えた！"
        else if {_random} is between 5 and 9:
            execute console command "scoreboard players add %player% bullet 3"
            message "&1>>> &e弾の数が３増えた！"
        else if {_random} is between 10 and 19:
            execute console command "scoreboard players add %player% bullet 1"
            message "&1>>> &e弾の数が１増えた！"
        else:
            message "&1>>> &eハズレ..."