g, c, p = map(int, input().split())
s = input()

n = g + c + p
ans = 0
for i in range(n):
    if s[i] == 'G':
        if p > 0:
            ans += 3
            p -= 1
        elif g > 0:
            ans += 1
            g -= 1
        else:
            c -= 1
    elif s[i] == 'C':
        if g > 0:
            ans += 3
            g -= 1
        elif c > 0:
            ans += 1
            c -= 1
        else:
            p -= 1
    else:
        if c > 0:
            ans += 3
            c -= 1
        elif p > 0:
            ans += 1
            p -= 1
        else:
            g -= 1
print(ans)