import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int [] yuki_GCP = new int [3];
        for(int i=0; i<3; i++){
            yuki_GCP[i]=sc.nextInt();
        }
        String S = sc.next();
        int [] friend_GCP = new int [3];
        for(int i=0; i<S.length(); i++){
            int a = S.charAt(i);
            if(a=='G'){friend_GCP[0]++;}
            if(a=='C'){friend_GCP[1]++;}
            if(a=='P'){friend_GCP[2]++;}
        }
        int win=0;
        int draw=0;
        for(int i=0; i<3; i++){
            int t = Math.min(yuki_GCP[i],friend_GCP[(i+1)%3]);
            win+=t;
            yuki_GCP[i%3]-=t;
            friend_GCP[(i+1)%3]-=t;
        }
        for(int i=0; i<3; i++){
            int t = Math.min(yuki_GCP[i],friend_GCP[i]);
            draw+=t;
        }
        int point = 3*win + draw;
        System.out.println(point);
    }
}