model;

param m;

param n;

param l;

set plants :$=1..$ n;

set procs :$=1..$ m;

set periods :$=1..$ l;

param p$\{$i in procs, j in plants, t in periods$\}$;

param b$\{$i in procs, t in periods$\}$;

param r$\{$j in plants t in periods$\}$;

param d$\{$t in periods$\}$;

var x$\{$j in plants, t in periods$\}>=0$;

maximize retn: sum$\{$j in plants, t in periods$\}$ r$[$j$,$ t$]*$x$[$j$,$ t$]$;

subject to

caps$\{$ i in procs, t in periods$\}$: sum$\{$j in plants$\}$ p$[$i$,$ j$,$ t$]*$x$[$j$,$ t$]<=$ b$[$i$,$ t$]$;

demd $\{$t in periods$\}$: sum$\{$j in plants$\}$ x$[$j$,$ t$]>=$ d$[$t$]$;

data;

param l :$=4$;

param m :$=2$;

param n :$=3$;

param d :$=1200230032504500$;

param r: $1234$ :$=$

$111151910$