import Control.Applicative

main :: IO()
main = do
     [g,c,p] <- map (read::String->Int) . words <$> getLine
     s <- getLine
     let (sg,sc,sp) = count s
     let (g',c',p') = (min' g sc,min' c sp,min' p sg)
     let (g'',c'',p'') = (g-g',c-c',p-p')
     let (g''',c''',p''') = (sg-p',sc-g',sp-c')
     print $ (g'+c'+p')*3 + (min' g'' g''' + min' c'' c''' + min' p'' p''')

count (x:xs)
     | x == 'G' = (1,0,0) `add` count xs
     | x == 'C' = (0,1,0) `add` count xs
     | x == 'P' = (0,0,1) `add` count xs
     where add (a,b,c) (a',b',c') = (a+a',b+b',c+c')
count [] = (0,0,0)

min' a b = minimum [a,b]