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

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  vector<int> v(3);
  string s;
  rep(i, 3) cin >> v[i];
  cin >> s;
  vector<int> cnt(3, 0);
  for (char ch : s) {
    if (ch == 'G') cnt[0]++;
    if (ch == 'C') cnt[1]++;
    if (ch == 'P') cnt[2]++;
  }
  int ans = 0;
  rep(i, 3) {
    int tmp = min(v[i], cnt[(i + 1) % 3]);
    ans += tmp * 3;
    v[i] -= tmp, cnt[(i + 1) % 3] -= tmp;
  }
  rep(i, 3) ans += min(v[i], cnt[i]);
  cout << ans << '\n';
  return 0;
}