#include <bits/stdc++.h> using namespace std; typedef pair<int,int> P; typedef pair<int,pair<int,int>> PP; typedef long long ll; const double EPS = 1e-8; const int INF = 1e9; const int MOD = 1e9+7; int dy[] = {0,1,0,-1}; int dx[] = {1,0,-1,0}; int main(void) { int g,c,p; cin >> g >> c >> p; string s; cin >> s; int gg,cc,pp; gg = cc = pp = 0; for(int i=0;i<s.size();i++){ if(s[i] == 'G'){ gg++; }else if(s[i] == 'C'){ cc++; }else if(s[i] == 'P'){ pp++; } } int sum = 0; int r; r = min(g,cc); g -= r;cc -= r;sum += r*3; r = min(c,pp); c -= r;pp -= r;sum += r*3; r = min(p,gg); p -= r;gg -= r;sum += r*3; sum += min(g,gg) + min(c,cc) + min(p,pp); cout << sum << endl; return 0; }