#include <bits/stdc++.h>
using namespace std;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
int g1,c1,p1,g2,c2,p2;
string s;
int main(){
    cin >> g1 >> c1 >> p1 >> s;
    for(auto v : s){
        if(v=='G')g2++;
        if(v=='C')c2++;
        if(v=='P')p2++;
    }
    int r = 0, a;
    a=min(g1,c2),g1-=a,c2-=a,r+=3*a;
    a=min(c1,p2),c1-=a,p2-=a,r+=3*a;
    a=min(p1,g2),p1-=a,g2-=a,r+=3*a;
    r+=min(g1,g2)+min(c1,c2)+min(p1,p2);
    cout << r << endl;
}