#include<iostream>
#include<algorithm>
#include<string>
using namespace std;

// problems/252
int main() {
	int g, c, p;
	cin >> g >> c >> p;

	string s;
	cin >> s;

	int eg, ec, ep;
	eg = ec = ep = 0;
	for (int i = 0; i < s.length(); i++) {
		if (s[i] == 'G')  eg += 1;
		else if (s[i] == 'C')  ec += 1;
		else if (s[i] == 'P')  ep += 1;
	}

	//cout << g << " " << c << " " << p << endl;
	//cout << eg << " " << ec << " " << ep << endl;

	int result;
	result = 3 * (min(g, ec) + min(c, ep) + min(p, eg));
	g -= min(g, ec);
	ec -= min(g, ec);
	c -= min(c, ep);
	ep -= min(c, ep);
	p -= min(p, eg);
	eg -= min(p, eg);

	if (eg > 0 && g > 0) result += min(g, eg);
	if (ec > 0 && c > 0) result += min(c, ec);
	if (ep > 0 && p > 0) result += min(p, ep);

	cout << result << endl;
	return 0;
}