#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int A[3]; rep(i,3) cin >> A[i];
    int B[3] = {};
    string S; cin >> S;
    for(char c : S) {
        if(c == 'G') B[0]++;
        if(c == 'C') B[1]++;
        if(c == 'P') B[2]++;
    }

    int ans = 0;
    rep(i,3) {
        int k = min(A[i], B[(i + 1) % 3]);
        ans += k * 3;
        A[i] -= k;
        B[(i + 1) % 3] -= k;
    }

    rep(i,3) ans += min(A[i], B[i]);
    cout << ans << endl;
}