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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int G,C,P; cin >> G >> C >> P;
    int g = 0,c = 0,p = 0;
    string s; cin >> s;
    for(auto ss : s) g += ss=='G',c += ss=='C',p += ss=='P';

    int win = min(G,c),answer = win*3;
    G -= win,c -= win;
    win = min(C,p),answer += win*3;
    C -= win,p -= win;
    win = min(P,g),answer += win*3;
    P -= win,g -= win;
    answer += min(G,g)+min(C,c)+min(P,p);
    cout << answer << endl;
}