#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
	int g, c, p;
	int enemyG = 0, enemyC = 0, enemyP = 0;
	int score = 0;
	string s;
	cin >> g >> c >> p >> s;

	for (int i = 0; i < s.size(); i++) {
		if (s[i] == 'G') {
			enemyG++;
		} else if (s[i] == 'C') {
			enemyC++;
		} else if(s[i] == 'P') {
			enemyP++;
		}
	}

	int gWin = min(g, enemyC);
	int cWin = min(c, enemyP);
	int pWin = min(p, enemyG);

	g -= gWin, enemyC -= gWin;
	c -= cWin, enemyP -= cWin;
	p -= pWin, enemyG -= pWin;

	score += 3 * (gWin + cWin + pWin);

	int gDraw, cDraw, pDraw;

	gDraw = min(g, enemyG);
	cDraw = min(c, enemyC);
	pDraw = min(c, enemyP);

	score += gDraw + cDraw + pDraw;
	
	cout << score << endl;
	return 0;
}