import sys

sys.setrecursionlimit(1000000)

N = int(input())
P, Q, R = map(float, input().split())


class vec:
    def __init__(self, x):
        self.x = x

    def __and__(self, other):
        return vec(self.x * other.x * (1.0 - R) + (1.0 - self.x * other.x) * R)

    def __or__(self, other):
        return vec(
            (1.0 - (1.0 - self.x) * (1.0 - other.x)) * (1.0 - R)
            + (1.0 - self.x) * (1.0 - other.x) * R
        )


def r(a, b):
    return vec(a.x * b.x * P + (1.0 - a.x * b.x) * Q)


y = vec(1.0)
n = vec(0.0)

S = (
    input()
    .replace("random", "r")
    .replace("and", "&")
    .replace("or", "|")
    .replace("YES", "y ")
    .replace("NO", "n ")
    .replace(" y", " ,y")
    .replace(" n", " ,n")
    .replace(" (", " ,(")
    .replace(" r", " ,r")
    .replace(")r", "),r")
    .replace(")n", "),n")
    .replace(")(", "),(")
    .replace(")r", "),r")
)

s = eval(S)

print(int(s.x * 100.0))