h={"G"=>0,"C"=>0,"P"=>0}
g1,c1,p1=gets.split.map{|e| e.to_i}


gets.chomp.chars{|e|
	h[e]=h[e]+1
}
ans=0
d1=[h["G"],p1].min
d2=[h["P"],c1].min
d3=[h["C"],g1].min
ans=(d1+d2+d3)*3

p1=p1-d1
h["G"]=h["G"]-d1

c1=c1-d2
h["P"]=h["P"]-d2

g1=g1-d3
h["C"]=h["C"]-d3

ans=ans+[h["G"],g1].min
ans=ans+[h["P"],p1].min
ans=ans+[h["C"],c1].min
puts ans