How To Declaration Of Multiple Variables.

hi, im modifying one of the ARC examples for custom object avoidance 2. my robot is avoiding most obsticles right now. but when he gets boxed in I just want it to backup when it detects the left,right, center at 255. I tried this

if($PingL,$PingR,$PingC < $MinDist)
  Goto(AllBad)
endif

how can I do this?

here is the code

# Set the servo left position
$PosL = 20

# Set the servo center position
$PosC = 50

# Set the servo right position
$PosR = 80

# Set the mininum distance
$MinDist = 60

# Begin moving
Forward()
PWM(d19,35)

:Loop

# Scan left
Servo(d3, $PosL)
Sleep(150)
$PingL = GetPing(d4, d5)
if ($PingL < $MinDist)
  Goto(LeftBad)
endif

# Scan Center
Servo(d3, $PosC)
Sleep(150)
$PingC = GetPing(d4, d5)
if ($PingC < $MinDist)
  Goto(CenterBad)
endif

# Scan Right
Servo(d3, $PosR)
Sleep(150)
$PingR = GetPing(d4, d5)
if ($PingR < $MinDist)
  Goto(RightBad)
endif

# Scan Center again
Servo(d3, $PosC)
Sleep(150)
$PingC = GetPing(d4, d5)
if ($PingC < $MinDist)
  Goto(CenterBad)
endif
   

Goto(Loop)
:AllBad
Reverse(100,1000)
Right(100,960)

:LeftBad
Right(100, 960)
Forward(100)
Return()

:CenterBad
right(100, 960)
Forward(100)
Return()

:RightBad
Left(100, 960)
Forward(100)