#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>
#include<limits>

#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ll, string> pls;

int main()
{
	int G, C, P;
	int g = 0 , c = 0 , p = 0;
	string s;
	cin >> G >> C >> P >> s; 

	for (int i = 0; i < s.size(); i++) {
		if (s[i] == 'G')g++;
		if (s[i] == 'C')c++;
		if (s[i] == 'P')p++;
	}

	ll ans = 0;
	if (G >= c) {
		ans += c * 3;
		G -= c;
		c = 0;
	}
	else {
		ans += G * 3;
		c -= G;
		G = 0;
	}
	if (C >= p) {
		ans += p * 3;
		C -= p;
		p = 0;
	}
	else {
		ans += C * 3;
		p -= C;
		C = 0;
	}
	if (P >= g) {
		ans += g * 3;
		P -= g;
		g = 0;
	}
	else {
		ans += P * 3;
		g -= P;
		P = 0;
	}

	if (G != 0 && g != 0) 
		ans += min(G,g);
	if (P != 0 && p != 0)
		ans += min(P,p);
	if (C != 0 & c != 0)
		ans += min(C,c);

	cout << ans << endl;

	return 0;
}