#include <stdio.h>
#include <string.h>
#include <iostream>
#include <math.h>


using namespace std;

int main(){
    int g,g2 = 0,c,c2 = 0,p,p2 = 0,n,ans = 0;
    char s[33];
    scanf("%d %d %d\n%s",&g,&c,&p,s);
    
    n = g + c + p;
    
    for(int i = 0;i < n;i++){
        if(s[i] == 'G') g2++;
        else if(s[i] == 'C') c2++;
        else p2++;
    }
    
    int tmp = min(g2,p);
    ans += tmp*3,g2 -= tmp,p -= tmp;
    tmp = min(c2,g),ans += tmp*3,c2 -= tmp,g -= tmp;
    tmp = min(p2,c),ans += tmp*3,p2 -= tmp,c -= tmp;
    ans += (min(g2,g) + min(c2,c) + min(p2,p));
    
    printf("%d\n",ans);
    
    
    return 0;
}