#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>

using namespace std;

int main() {
	int mine[3] = {};
	int yours[3] = {};
	string s;

	cin >> mine[0] >> mine[1] >> mine[2];
	cin >> s;
	for (int i = 0; i < s.size(); i++) {
		switch (s[i]) {
			case 'G' : yours[0]++; break;
			case 'C' : yours[1]++; break;
			case 'P' : yours[2]++; break;
			default: break;
		}
	}

	int point = 0;
	// win
	for (int i = 0; i < 3; i++) {
		int idx_y = (i + 1) % 3;

		int wins = min(mine[i], yours[idx_y]);
		point += wins * 3;
		mine[i] -= wins;
		yours[idx_y] -= wins;
	}

	// draw
	for (int i = 0; i < 3; i++) {
		point += min(mine[i], yours[i]);
	}

	cout << point << endl;
	return 0;
}