#include <iostream>
using namespace std;
#include <cstdio>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#define FOR(i,a,b) for(int (i)=(a);i<(b);i++)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;

/* ここからが本編 */


int main(void)
{
   int i,j,k,l;
   int g1,c1,p1;
   int g2 = 0 ,c2 = 0 ,p2 = 0;
   int ans = 0;
   int max,min;
   char s[305];
   cin >> g1 >> c1 >> p1;
   cin >> s;

   for(i=0;s[i];i++) {
      switch(s[i]) {
      case 'G' : g2++; break;
      case 'C' : c2++; break;
      case 'P' : p2++; break;
      }
   }

   min = g2;
   if(g2 > p1) min = p1;
   ans += min * 3; g2 -= min; p1 -= min;

   min = c2;
   if(c2 > g1) min = g1;
   ans += min * 3; c2 -= min; g1 -= min;

   min = p2;
   if(p2 > c1) min = c1;
   ans += min * 3; p2 -= min; c1 -= min;


   min = g2;
   if(g2 > g1) min = g1;
   ans += min; g2 -= min; g1 -= min;

   min = c2;
   if(c2 > c1) min = c1;
   ans += min; c2 -= min; c1 -= min;

   min = p2;
   if(p2 > p1) min = p1;
   ans += min; p2 -= min; p1 -= min;

   printf("%d\n",ans);
   return 0;
}