g,c,p=map(int,input().split())
s=list(input())
g2,c2,p2=0,0,0
for x in s:
    if x=="G":
        g2+=1
    elif x=="C":
        c2+=1
    else:
        p2+=1

l=[g2,c2,p2]
ans=0
ans+=3*min(g,c2)
ans+=3*min(c,p2)
ans+=3*min(p,g2)
g-=min(g,c2)
c-=min(c,p2)
p-=min(p,g2)
if g>0 and g2>0:
    ans+=min(g,g2)
elif c>0 and c2>0:
    ans+=(c,c2)
elif p>0 and p2>0:
    ans+=(p,p2)

print(ans)