#include<stdio.h>

int min(int a,int b){
	if(a<b){return a;}else{return b;}
}

int main(void){
	int G,C,P;
	char S[301];
	int i,G2,C2,P2,ans;

	scanf("%d %d %d",&G,&C,&P);
	scanf("%s",S);

	G2=0;C2=0;P2=0;
	for(i=0;i<G+C+P;i++){
		if(S[i]=='G'){G2++;}
		if(S[i]=='C'){C2++;}
		if(S[i]=='P'){P2++;}
	}

	ans = 0;

	i = min(G,C2);
	ans = ans + i*3;
	G = G - i;
	C2 = C2 - i;

	i = min(C,P2);
	ans = ans + i*3;
	C = C - i;
	P2 = P2 - i;

	i = min(P,G2);
	ans = ans + i*3;
	P = P - i;
	G2 = G2 - i;

	ans = ans + min(P,P2) + min(G,G2) + min(C,C2);

	printf("%d\n",ans);

}