#include<bits/stdc++.h>
using namespace std;
int C[3];
main(){
    int M[3];
    scanf("%d%d%d",&M[0],&M[1],&M[2]);
    char S[51];
    scanf("%s",S);
    for(int i = 0;i < strlen(S);i++){
        if(S[i]=='G')C[0]++;
        else if(S[i]=='C')C[1]++;
        else C[2]++;
    }
    int point = 0,n;
    for(int i = 0;i < 3;i++){
        n = min(M[i],C[(i+1)%3]);
        M[i] -= n;C[(i+1)%3] -= n;point += n*3;
    }
    for(int i = 0;i < 3;i++){
        n = min(M[i],C[i]);
        M[i] -= n;C[i] -= n;point += n;
    }
    printf("%d\n",point);
}