IDENTIFICATION DIVISION
PROGRAM-ID Radioactive_Decay

ENVIRONMENT DIVISION
ENGINE Anabrid-THAT
REQUIRES Coefficient 2
REQUIRES Integrator 1
REQUIRES Inverter 1

DATA DIVISION
OUTPUT OUTPUT.X N
ALIAS COEFFICIENT.1 InitialValue
ALIAS COEFFICIENT.2 Decay 

PROGRAM DIVISION
+1 -> InitialValue -> N0
N’, IC:N0 -> Integrator.1 -> -N
-N -> Decay -> -lambda*N=N’
-N -> Inverter.1 -> N

OPERATION DIVISION
MODE REPEAT
OP-TIME 20ms