//
//  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;
    
    while(count < 3) {
        std::cin >> te[count];
        sum += te[count];
        count++;
    }
    
    std::cin >> aite;
    moji = (char *)malloc( strlen(aite.c_str()) + 1 );
    std::sprintf(moji, "%s", aite.c_str());

    count = 0;
    while (count < sum) {
        switch(moji[count]) {
            case 'G' :
                if(te[2] > 0) {
                    point += 3;
                    te[2]--;
                }
                else if(te[0] > 0) {
                    point += 1;
                    te[0]--;
                }
                else {
                    te[1]--;
                }
                break;
                
            case 'C' :
                if(te[0] > 0) {
                    point += 3;
                    te[0]--;
                }
                else if(te[1] > 0) {
                    point += 1;
                    te[1]--;
                }
                else {
                    te[2]--;
                }
                break;

            case 'P' :
                if(te[1] > 0) {
                    point += 3;
                    te[1]--;
                }
                else if(te[2] > 0) {
                    point += 1;
                    te[2]--;
                }
                else {
                    te[0]--;
                }
                break;
            default:
                break;
        }
        count++;
    }
    
    std::cout << point << "\n";
    
    return 0;
}