Less is better if it happens naturally.

3 Lines of SAS is too much.

Check this out:

\nDO T=1 TO 99;\n  IF T =1 THEN COMMX=COMM1; ELSE COMMX=COMM2;\n  EXPS(T)=(1-((LOSS(T)* &LRHO * &LRAGE * &LRVEH * LROCT * PLK_LRF)\n            + (&GOE+&PTE+&COC+COMMX) - &IIR));\n  EXPY(T)=(1-((LOSS(T)* &LRHO * &LRAGE * &LRVEH * LROCT * PLK_LRF)\n            + (&GOE+&PTE+COMMX) - &IIR));\n  R= T-1;\n


Imagine hundreds of lines of this stuff.