command /setmid:
    trigger:
        set {Mid} to player's location

command /mid:
    trigger:
        set {MidPos} to distance between player and {Mid}
        set {MidPos} to round({MidPos})
        broadcast "&6&l %player%が%{MidPos}%mを通過しました"
on walking on diamond block:
    execute command "/mid" to location of player