import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Map;
import java.io.BufferedReader;
import java.io.InputStream;
 
/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class HelloWorld {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskD solver = new TaskD();
        solver.solve(1, in, out);
        out.close();
    }
 
    static class TaskD {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int gcp[] = new int[3];
            for(int i=0; i<3; i++){
                gcp[i] = in.nextInt();
            }
            String S = in.next();
            char s[] = S.toCharArray();
            int fgcp[] = new int[3];
            for(char c:s){
                if(c=='G') fgcp[0]++;            
                if(c=='C') fgcp[1]++;            
                if(c=='P') fgcp[2]++;            
            }
            int p=0;
            for(int i=0; i<3; i++){
                int num = Math.min(gcp[i],fgcp[(i+1)%3]);
                gcp[i] -= num;
                fgcp[(i+1)%3] -= num;
                p += 3*num;
            }
            for(int i=0; i<3; i++){
                int num = Math.min(gcp[i],fgcp[i]);
                gcp[i] -= num;
                fgcp[i] -= num;
                p += num;
            }
            out.println(p);

        }
    }
 
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
 
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
 
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
    }
}