//
//  main.cpp
//  Q256
//
//  Created by AkihiroKOBAYASHI on 7/10/15.
//  Copyright (c) 2015 Akhr5884. All rights reserved.
//

#include <iostream>
#include <string.h>
int main(int argc, const char * argv[]) {
    int te[3];
    int count = 0;
    int sum = 0;
    int point = 0;
    
    std::string aite;
    char *moji;
    int *already;
    
    while(count < 3) {
        std::cin >> te[count];
        sum += te[count];
        count++;
    }
    
    std::cin >> aite;
    moji = (char *)malloc( strlen(aite.c_str()) + 1 );
    already = (int*)malloc( strlen(aite.c_str()) + 1  );
    std::sprintf(moji, "%s", aite.c_str());
    
    // win
    count = 0;
    while (count < sum) {
        already[count] = 0;
        switch(aite[count]) {
            case 'G':
                if(te[2] > 0) {
                    te[2]--;
                    point += 3;
                    already[count] = 1;
                }
                break;
            case 'C':
                if(te[0] > 0) {
                    te[0]--;
                    point += 3;
                    already[count] = 1;
                }
                break;
            case 'P':
                if(te[1] > 0) {
                    te[1]--;
                    point += 3;
                    already[count] = 1;
                }
                break;
        }
        count++;
    }


    // draw
    count = 0;
    while (count < sum) {
        if(already[count] != 1) {
            switch(aite[count]) {
                case 'G':
                    if(te[0] > 0) {
                        te[0]--;
                        point += 1;
                        already[count] = 1;
                    }
                    break;
                case 'C':
                    if(te[1] > 0) {
                        te[1]--;
                        point += 1;
                        already[count] = 1;
                    }
                    break;
                case 'P':
                    if(te[0] > 0) {
                        te[0]--;
                        point += 1;
                        already[count] = 1;
                    }
                    break;
            }
        }
        count++;
    }
    
    
    std::cout << point << "\n";
    
    return 0;
}