#include <bits/stdc++.h>
using namespace std;
int main() {
    #ifdef DEBUG
    std::ifstream in("/home/share/inputf.in");
    std::cin.rdbuf(in.rdbuf());
    #endif
    int A[3], B[3] = {0}, C;
    cin >> A[0] >> A[1] >> A[2];
    string S;
    cin >> S;
    int ans = 0;
    for(int i = 0; i < S.length(); i++) {
        if(S[i] == 'G') B[0]++;
        if(S[i] == 'C') B[1]++;
        if(S[i] == 'P') B[2]++;
    }
    for(int j = 0; j < 3; j++) {
        for (int i = 0; i < 3; i++) {
            int k = (i - j + 4) % 3;
            C = min(A[i], B[k]);
            A[i] -= C, B[k] -= C;
            if(j == 0) ans += C * 3;
            if(j == 1) ans += C;
        }
    }
    cout << ans << endl;
    return 0;
}