function countdown(minute: 15, second: 0):
    while {_minute} is not 0:
        if {_second} is 0:
            remove 1 from {_minute}
            set {_second} to 60
        remove 1 from {_second}
        loop all players:
            set action bar of loop-player to "｟&5&l残り時間&a&l: &e%{_minute}%&7分&e%{_second}%&7秒｠"
        wait 1 second
    if {_minute} is 0:
        while {_second} is not 0:
            remove 1 from {_second}
            loop all players:
                set action bar of loop-player to "｟&5&l残り時間&a&l: &e%{_second}%&7秒｠"
            wait 1 second