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
COEFFICIENT.1 InitialValue
COEFFICIENT.2 Decay 

PROGRAM DIVISION
+1 -> COEFFICIENT.InitialValue -> N0
N’, IC:N0 -> INTEGRATOR -> -N
-N -> COEFFICIENT.Decay -> -lambda*N=N’
-N -> INVERTER -> N

OPERATION DIVISION
MODE REPEAT
OP-TIME 20ms