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


int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	int my_hand[3]; cin >> my_hand[0] >> my_hand[1] >> my_hand[2];
	string s; cin >> s;
	int opp_hand[3] = {0, 0, 0};
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'G') opp_hand[0]++;
		if(s[i] == 'C') opp_hand[1]++;
		if(s[i] == 'P') opp_hand[2]++;
	}
	int ans = 0;
	for(int i = 0; i < 3; i++) {
		int tmp = min(my_hand[i], opp_hand[(i + 1) % 3]);
		ans += 3 * tmp;
		my_hand[i] -= tmp;
		opp_hand[(i + 1) % 3] -= tmp;
	}
	for(int i = 0; i < 3; i++) {
		ans += min(my_hand[i], opp_hand[i]);
	}
	cout << ans << endl;
	return 0;                                              
}