package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

var s = bufio.NewScanner(os.Stdin)

func next() string {
	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}
func nextLong() int64 {
	i, e := strconv.ParseInt(next(), 10, 64)
	if e != nil {
		panic(e)
	}
	return i
}
func main() {
	D := [3]int{}
	D[0] = nextInt()
	D[1] = nextInt()
	D[2] = nextInt()

	S := next()
	point := 0
	for i := 0; i < len(S); i++ {
		var P = 0
		switch {
		case S[i] == 'G':
			P = 0
		case S[i] == 'C':
			P = 1
		case S[i] == 'P':
			P = 2
		}
		for i := -1; i < 2; i++ {
			p := (P + i + 3) % 3
			if D[p] > 0 {
				D[p]-=1
				if i == -1 {
					point+=3
				}else if i == 0 {
					point+=1
				}
				break
			}
		}
	}
	fmt.Println(point)

}