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

int main() {
    int A[3], B[3] = {};
    string S;
    for (int i = 0; i < 3; i++) {
        cin >> A[i];
    }
    cin >> S;
    for (auto& c : S) {
        if (c == 'G')
            B[0]++;
        else if (c == 'C')
            B[1]++;
        else
            B[2]++;
    }

    int ans = 0;
    for (int i = 0; i < 3; i++) {
        int j = (i + 1) % 3;
        int t = min(A[i], B[j]);
        A[i] -= t;
        B[j] -= t;
        ans += t * 3;
    }
    for (int i = 0; i < 3; i++) {
        ans += min(A[i], B[i]);
    }

    cout << ans << endl;
}