SPOJ 4301 "Tables"

問題:https://www.spoj.pl/problems/AE1B/

scan [gets stdin] {%s %s %s} n k s
set a [lsort -integer -decreasing [gets stdin]]
set m [expr {$k*$s}]
set sum 0
for {set c 0} {$sum<$m} {incr c} {
	incr sum [lindex $a $c]
}
puts $c