*r, = map(int,input().split())
s = [0,0,0]
for i in input():
    if i=="G": s[0]+=1
    if i=="C": s[1]+=1
    if i=="P": s[2]+=1
ans = 0
for i in range(3):
    v = min(r[i],s[(i+1)%3])
    ans += 3*v
    r[i] -= v
    s[(i+1)%3] -= v
for i in range(3):
    ans += min(r[i],s[i])
print(ans)