/* -*- coding: utf-8 -*-
 *
 * 161.cc: No.161 制限ジャンケン - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

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

  int og = 0, oc = 0, op = 0;
  for (int i = 0; i < s.size(); i++)
    switch (s[i]) {
    case 'G': og++; break;
    case 'C': oc++; break;
    case 'P': op++; break;
    }

  int wg = min(g, oc), wc = min(c, op), wp = min(p, og);
  g -= wg, oc -= wg;
  c -= wc, op -= wc;
  p -= wp, og -= wp;

  int ag = min(g, og), ac = min(c, oc), ap = min(p, op);

  int sum = (wg + wc + wp) * 3 + (ag + ac + ap);
  printf("%d\n", sum);
  return 0;
}