import sys
input=lambda: sys.stdin.readline().rstrip()
g,c,p=map(int,input().split())
S=input()
ans=0
gs,cs,ps=0,0,0
for s in S:
  if s=="G":
    gs+=1
  elif s=="C":
    cs+=1
  else:
    ps+=1
if gs>0 and p>0:
  w=min(gs,p)
  gs-=w
  p-=w
  ans+=3*w
if cs>0 and g>0:
  w=min(cs,g)
  cs-=w
  g-=w
  ans+=3*w
if ps>0 and c>0:
  w=min(ps,c)
  ps-=w
  c-=w
  ans+=3*w
print(ans+min(gs,g)+min(cs,c)+min(ps,p))