#include "bits/stdc++.h"
using namespace std;

int main() {
	int G, C, P;
	cin >> G >> C >> P;
	string S;
	cin >> S;
	int EG = 0, EC = 0, EP = 0;
	for (char c : S){
		if (c == 'G') EG++;
		else if (c == 'C') EC++;
		else EP++;
	}

	int ans = 0;
	int temp;
	
	temp = min(G, EC);
	ans += 3 * temp; G -= temp; EC -= temp;

	temp = min(C, EP);
	ans += 3 * temp; C -= temp; EP -= temp;

	temp = min(P, EG);
	ans += 3 * temp; P -= temp; EG -= temp;

	temp = min(G, EG);
	ans += temp; G -= temp; EG -= temp;

	temp = min(C, EC);
	ans += temp; C -= temp; EC -= temp;

	temp = min(P, EP);
	ans += temp; P -= temp; EP -= temp;

	cout << ans << endl;
}