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

int main() {
    int g, c, p;
    cin >> g >> c >> p;
    string s;
    cin >> s;

    int gg = 0;
    int cc = 0;
    int pp = 0;
    rep(i, g+c+p) {
        if(s[i] == 'G') gg++;
        else if(s[i] == 'C') cc++;
        else if(s[i] == 'P') pp++;
    }

    int gr = g - cc;
    int cr = c - pp;
    int pr = p - gg;
    int result = 3 * (min(g, cc) + min(c, pp) + min(p, gg));
    if(gr < 0 && cr > 0) result += min(-gr, cr);
    if(cr < 0 && pr > 0) result += min(-cr, pr);
    if(pr < 0 && gr > 0) result += min(-pr, gr);

    cout << result << "\n";
}