#include "bits/stdc++.h"

using namespace std;

//-------------------------------

#define int long long

//-------------------------------

#define rep(i, n) for (int i = 0; i < (n); i++)
#define FOR(i, a, b) for (int i = (a), int size##i = (b); i < size##i; i++)
#define FORR(i, a, b) for (int i = (a); i >= (b); i--)

#define all(v) v.begin(), v.end()

#define tint(str) atoi(str.c_str())
#define tstr(num) to_string(num)

#define prt(x) cout << x << endl

#ifdef DEBUG
#define dbg(x) cout << "[DBG] " << x << endl
#else
#define dbg(x)
#endif

typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<vector<int>> VVI;
template<typename T>
using PQ = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using RPQ = priority_queue<T, vector<T>, less<T>>;

int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};

//-------------------------------

int n;
double p, q, r;
string s;

int cr = 0;

char gnt() {
    if (cr == s.size()) {
        return 0;
    }
    switch (s[cr]) {
    case '(':
        cr++;
        return '(';
    case ')':
        cr++;
        return ')';
    case ' ':
        cr++;
        return gnt();
    case 'Y':
        cr += 3;
        return 'Y';
    case 'N':
        cr += 2;
        return 'N';
    case 'r':
        cr += 6;
        return 'r';
    case 'a':
        cr += 3;
        return 'a';
    case 'o':
        cr += 2;
        return 'o';
    default:
        return -1;
    }
}

inline double myrand(double a, double b) {
    return a * b * p + (1 - a * b) * q;
}

inline double myor(double a, double b) {
    return (a + b - a * b) * (1 - r) + ((1 - a) * (1 - b)) * r;
}

inline double myand(double a, double b) {
    return a * b * (1 - r) + (1 - a * b) * r;
}

double pe();
double pt();
double pf();

double pe() {
    auto a = pt();
    int prev = cr;
    while(gnt() == 'o') {
        a = myor(a, pt());
        prev = cr;
    }
    cr = prev;
    return a;
}

double pt() {
    auto a = pf();
    int prev = cr;
    while(gnt() == 'a') {
        a = myand(a, pf());
        prev = cr;
    }
    cr = prev;
    return a;
}

double pf() {
    switch(gnt()) {
        case 'Y':
            return 1;
        case 'N':
            return 0;
        case '(': {
            auto a = pe();
            gnt();
            return a;
        }
        case 'r': {
            gnt();
            auto a = pe();
            auto b = pe();
            gnt();
            return myrand(a, b);
        }
    }
}

signed main() {
    char c;
    cin >> n >> p >> q >> r;

    getline(cin, s);
    getline(cin, s);

    cout << (int)(pe() * 100) << endl;

    return 0;
}