import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    g, c, p = map(int, input().split())
    s = input()
    gx, cx, px = s.count('G'), s.count('C'), s.count('P')

    gcx, cpx, pgx = min(g, cx), min(c, px), min(p, gx)
    g, c, p, gx, cx, px = g - gcx, c - cpx, p - pgx, gx - pgx, cx - gcx, px - cpx
    return 3 * (gcx + cpx + pgx) + min(g, gx) + min(c, cx) + min(p, px)


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)