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

int yukiG, yukiC, yukiP;
string S;
int tomoG, tomoC, tomoP;

void input(istream& in)
{
	in >> yukiG >> yukiC >> yukiP;
	in >> S;
}

int resolve()
{
	tomoG = tomoC = tomoP = 0;
	for (char ch : S) {
		switch (ch) {
		case 'G': tomoG++; break;
		case 'C': tomoC++; break;
		case 'P': tomoP++; break;
		}
	}

	int score = 0;
	int tmp;

	tmp = (yukiG < tomoC) ? yukiG : tomoC;
	yukiG -= tmp;
	tomoC -= tmp;
	score += 3 * tmp;

	tmp = (yukiC < tomoP) ? yukiC : tomoP;
	yukiC -= tmp;
	tomoP -= tmp;
	score += 3 * tmp;

	tmp = (yukiP < tomoG) ? yukiP : tomoG;
	yukiP -= tmp;
	tomoG -= tmp;
	score += 3 * tmp;

	tmp = (yukiG < tomoG) ? yukiG : tomoG;
	score += tmp;

	tmp = (yukiC < tomoC) ? yukiC : tomoC;
	score += tmp;

	tmp = (yukiP < tomoP) ? yukiP : tomoP;
	score += tmp;

	return score;
}

int main(int argc, char **argv)
{
	input(cin);
	cout << resolve() << endl;
	return 0;
}