#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int v, w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	int G, C, P; cin >> G >> C >> P;
	string S; cin >> S;
	int g = 0, c = 0, p = 0;
	for (int i = 0; i < S.length(); i++) {
		if (S[i] == 'G') g++;
		if (S[i] == 'C') c++;
		if (S[i] == 'P') p++;
	}
	int k, ans = 0;
	k = min(G, c); G -= k; c -= k; ans += k * 3;
	k = min(C, p); C -= k; p -= k; ans += k * 3;
	k = min(P, g); P -= k; g -= k; ans += k * 3;
	k = min(G, g); G -= k; g -= k; ans += k;
	k = min(C, c); C -= k; c -= k; ans += k;
	k = min(P, p); P -= k; p -= k; ans += k;
	cout << ans << endl;
}