#include <bits/stdc++.h>

#define REP(i, x, n) for(int i = x; i < (int)(n); i++)
#define rep(i, n) REP(i, 0, n)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define F first
#define S second
#define mp make_pair

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
// typedef pair<int, int> P;

int main() {
  // ios_base::sync_with_stdio(false);
  int G, C, P;
  string S;
  cin >> G >> C >> P;
  cin >> S;
  
  int g, c, p;
  g = c = p = 0;
  rep(i, S.size()) {
    if(S[i] == 'G') g++;
    if(S[i] == 'C') c++;
    if(S[i] == 'P') p++;
  }

  int ans = 0;
  ans += min(G, c) * 3;
  ans += min(C, p) * 3;
  ans += min(P, g) * 3;
  G = max(0, G - c);
  C = max(0, C - p);
  P = max(0, P - g);
  g = max(0, c - G);
  c = max(0, p - C);
  p = max(0, g - P);
  ans += min(G, g);
  ans += min(C, c);
  ans += min(P, p);

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