#include <bits/stdc++.h>
#define REP(i,n) for(int i = 0; i < (int)(n); ++i)
using namespace std;

int main() {
    int G, C, P;
    cin >> G >> C >> P;
    string S;
    cin >> S;
    int g = 0, c = 0, p = 0;
    REP(i,S.size()){
        if (S[i] == 'G') g++;
        if (S[i] == 'C') c++;
        if (S[i] == 'P') p++;
    }
    int ans = 0;
    if(P>=g){
        ans += 3*g;
        P -= g;
        g = 0;
    }else{
        ans += 3*P;
        g -= P;
        P = 0;
    }

    if(C>=p){
        ans += 3*p;
        C -= p;
        p = 0;
    }else{
        ans += 3*C;
        p -= C;
        C = 0;
    }

    if(G>=c){
        ans += 3*c;
        G -= c;
        c = 0;
    }else{
        ans += 3*G;
        c -= G;
        G = 0;
    }

    ans += min(g,G);
    ans += min(c,C);
    ans += min(p,P);

    cout << ans << endl;
    return 0;
}