#include<stdio.h>

int main(void){
	int g,c,p,eg=0,ec=0,ep=0,l,i,r = 0;
	char s[512];
	scanf("%d%d%d%s",&g,&c,&p,s);
	l = g+c+p;
	for(i = 0;i < l;i++){
		if(s[i] == 'G'){eg++;}
		if(s[i] == 'C'){ec++;}
		if(s[i] == 'P'){ep++;}
	}
	if(eg<=p){r+=(3*eg);p-=eg;eg=0;}else{r+=(3*p);eg-=p;p=0;}
	if(ec<=g){r+=(3*ec);g-=ec;ec=0;}else{r+=(3*g);ec-=g;g=0;}
	if(ep<=c){r+=(3*ep);c-=ep;ep=0;}else{r+=(3*c);ep-=c;c=0;}
	if(eg<=g){r+=eg;}else{r+=g;}
	if(ec<=c){r+=ec;}else{r+=c;}
	if(ep<=p){r+=ep;}else{r+=p;}
	printf("%d\n",r);
	return 0;
}