//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 より
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

//

type DP = [f64; 2];

fn factor(s: &[u8], k: &mut usize, p: &[f64]) -> DP {
    let c = s[*k];
    match c {
        b'Y' => {
            *k += 3;
            [0.0, 1.0]
        },
        b'N' => {
            *k += 2;
            [1.0, 0.0]
        },
        b'r' => {
            *k += 7;
            let a = exp(s, k, p);
            let b = exp(s, k, p);
            *k += 1;
            let x = a[1] * b[1] * p[0] + (1.0 - a[1] * b[1]) * p[1];
            [1.0 - x, x]
        },
        b'(' => {
            *k += 1;
            let res = exp(s, k, p);
            *k += 1;
            res
        },
        _ => unreachable!(),
    }
}

fn term(s: &[u8], k: &mut usize, p: &[f64]) -> DP {
    let mut res = factor(s, k, p);
    while *k < s.len() && s[*k] == b'a' {
        *k += 3;
        let v = term(s, k, p);
        let x = res[1] * v[1];
        let x = x * (1.0 - p[2]) + (1.0 - x) * p[2];
        res = [1.0 - x, x];
    }
    res
}

fn exp(s: &[u8], k: &mut usize, p: &[f64]) -> DP {
    let mut res = term(s, k, p);
    while *k < s.len() && s[*k] == b'o' {
        *k += 2;
        let v = term(s, k, p);
        let x = 1.0 - res[0] * v[0];
        let x = x * (1.0 - p[2]) + (1.0 - x) * p[2];
        res = [1.0 - x, x];
    }
    res
}

fn run() {
    input! {
        n: usize,
        p: [f64; 3],
        s: bytes,
    }
    let ans = exp(&s, &mut 0, &p)[1];
    println!("{}", (ans * 100.0).floor() as usize);
}

fn main() {
    run();
}