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

int main() {
    int a[3];
    cin>>a[0]>>a[1]>>a[2];
    string s;cin>>s;
    int b[3]{};
    for (char c:s) {
        if (c=='G')b[0]++;
        else if (c=='C')b[1]++;
        else b[2]++;
    }
    int ans=0;
    for (int i=0;i<3;i++) {
        int mn=min(a[i],b[(i+1)%3]);
        a[i]-=mn;
        b[(i+1)%3]-=mn;
        ans+=3*mn;
    }
    for (int i=0;i<3;i++) {
        ans+=min(a[i],b[i]);
    }
    cout<<ans<<endl;
    return 0;
}