#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <map>
using namespace std;
typedef long long LL;

int main(){
    int G, C, P;
    cin >> G >> C >> P;
    int og, oc, op;
    string S;
    cin >> S;
    for(int i = 0; i < S.size(); i++){
        if(S[i] == 'G') og++;
        if(S[i] == 'C') oc++;
        if(S[i] == 'P') op++;
    }
    LL ans = 0;
    ans += min(G, oc) * 3;
    G -= min(G, oc);
    ans += min(C, op) * 3;
    C -= min(C, op);
    ans += min(P, og) * 3;
    P -= min(P, og);
    ans += min(G, og);
    ans += min(C, oc);
    ans += min(P, op);
    cout << ans << endl;
    return 0;
}