#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
    #define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
        #define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
*/

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

  string s;
  cin >> s;
  int n = s.size();
  
  map<char, int> cnt;
  rep(i, n){
    cnt[s[i]]++;
  }
  
  int x = min(g, cnt['C']); 
  int y = min(c, cnt['P']); 
  int z = min(p, cnt['G']); 

  int ans = 3*(x + y + z);

  g -= x; cnt['C'] -= x;
  c -= y; cnt['P'] -= y;
  p -= z; cnt['G'] -= z;

  x = min(g, cnt['G']);
  y = min(c, cnt['C']);
  z = min(p, cnt['P']);

  ans += x+y+z;
  cout << ans << endl;

  return 0;
}