Problem $1$ penalty costs are $$1,400$ per week after week $12.$

$\backslash$table$[[$Activity Immediate Predecessor$($s$),$Normal Time $($weeks$),\backslash$table$[[$Crash$],[$Time $($weeks$)]],\backslash$table$[[$Normal$],[$Cost $($$$)]],\backslash$table$[[$Crash$],[$Cost $($$$)]],],[$A$,-,4,1,5,500,8,000],[$B$,-,5,3,7,500,10,000],[$C$,$A$,1,1,4,000,4,000],[$D$,$B$,6,3,5,500,12,500],[$E$,$B$,$ C$,7,6,4,500,6,500],[$F$,$D$,7,6,3,500,7,000]]$

a$.$ What is the minimum$-$cost schedule for this project?

The minimum$-$cost schedule is weeks. $($Enter your response as an integer.$)$