#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

signed main(void)
{
  int g, c, p, gg = 0, cc = 0, pp = 0;
  string s;
  cin >> g >> c >> p >> s;
  REP(i, s.size()) {
    if(s[i] == 'G') gg++;
    else if(s[i] == 'C') cc++;
    else if(s[i] == 'P') pp++;
  }

  int ret = 0;
  ret += 3*min(g, cc);
  ret += 3*min(c, pp);
  ret += 3*min(p, gg);
  g -= min(g, cc); gg -= min(g, cc);
  c -= min(c, pp); cc -= min(c, pp);
  p -= min(p, gg); pp -= min(p, gg);
  ret += min(g, gg);
  ret += min(c, cc);
  ret += min(p, pp);

  cout << ret << endl;

  return 0;
}