def read_data():
    G, C, P = map(int, input().split())
    S = input()
    return G, C, P, S

def solve(G, C, P, S):
    ng = S.count('G')
    nc = S.count('C')
    np = S.count('P')
    score = 0

    # ng <- P
    if ng >= P:
        score += 3 * P
        ng -= P
        P = 0
    else:
        score += 3 * ng
        P -= ng
        ng = 0
    # nc <- G
    if nc >= G:
        score += 3 * G
        nc -= G
        G = 0
    else:
        score += 3 * nc
        G -= nc
        nc = 0
    # np <- C
    if np >= C:
        score += 3 * C
        np -= C
        C = 0
    else:
        score += 3 * np
        C -= np
        np = 0

    # ng <- G
    if ng >= G:
        score += G
        ng -= G
        G = 0
    else:
        score += ng
        G -= ng
        ng = 0
    # nc <- C
    if nc >= C:
        score += C
        nc -= C
        C = 0
    else:
        score += nc
        C -= nc
        nc = 0
    # np <- P
    if np >= P:
        score += P
        np -= P
        P = 0
    else:
        score += np
        P -= np
        np = 0

    return score

if __name__ == '__main__':
    param = read_data()
    print(solve(*param))