package main

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

func nextInt() int {
        i, e := strconv.Atoi(nextString())
        if e != nil {
                panic(e)
        }
        return i
}

func nextFloat() float64 {
        f, e := strconv.ParseFloat(nextString(), 64)
        if e != nil {
                panic(e)
        }
        return f
}

func nextString() string {
        var sc = bufio.NewScanner(os.Stdin)
        sc.Split(bufio.ScanWords)
        sc.Scan()
        return sc.Text()
}

func main() {
        var G, C, P float64
        fmt.Scan(&G)
        fmt.Scan(&C)
        fmt.Scan(&P)
        S := nextString()
        var G2, C2, P2 float64
        for i := 0; i < len(S); i++ {
                if S[i] == 'G' {
                        G2++
                } else if S[i] == 'C' {
                        C2++
                } else {
                        P2++
                }
        }
        ans := 0.0
        x := math.Min(G, C2)
        G -= x
        C2 -= x

        ans += x * 3

        x = math.Min(C, P2)
        C -= x
        P2 -= x

        ans += x * 3

        x = math.Min(P, G2)
        P -= x
        G2 -= x

        ans += x * 3

        x = math.Min(G, G2)
        G -= x
        G2 -= x

        ans += x

        x = math.Min(C, C2)
        C -= x
        C2 -= x

        ans += x

        x = math.Min(P, P2)
        P -= x
        P2 -= x

        ans += x

        fmt.Println(int(ans))
}