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

int main() {
    int gcp[3] = {0};
    string a;
    cin >> gcp[0] >> gcp[1] >> gcp[2];
    cin >> a;
    int ngcp[3] = {0};
    ngcp[0] = (int) count(a.begin(), a.end(),'G');
    ngcp[1] = (int) count(a.begin(), a.end(),'C');
    ngcp[2] = (int) count(a.begin(), a.end(),'P');

    int ans = 0;
    for (int i=0; i< 3; i++) {
        if (ngcp[i] > gcp[(i+2)%3]) {
            ans += 3 * gcp[(i+2)%3];
            ngcp[i] -= gcp[(i+2)%3];
            gcp[(i+2)%3] = 0;
        } else {
            ans += 3 * ngcp[i];
            gcp[(i+2)%3] -= ngcp[i];
            ngcp[i] = 0;
        }
    }

    for (int i=0; i< 3; i++) {
        if (ngcp[i] > gcp[i]) {
            ans += gcp[i];
            ngcp[i] -= gcp[i];
            gcp[i] = 0;
        } else {
            ans += ngcp[i];
            gcp[i] -= ngcp[i];
            ngcp[i] = 0;
        }
    }

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