#include<bits/stdc++.h>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;
// const int mod = 998244353;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

int N;
double P, Q, R;
string S;
int ptr = 0;


double exp();

double term();

double fact() {
  if(S[ptr] == '(') {
    ptr++;
    double yes = exp();
    ptr++;
    return yes;
  } else if(S[ptr] == 'r') {
    // "random("
    ptr += 7;
    double l = exp();
    double r = exp();
    ptr += 1;
    return l * r * P + (1.0 - l * r) * Q;
  } else if(S[ptr] == 'Y') {
    // "YES"
    ptr += 3;
    return 1.0;
  } else {
    // "NO"
    ptr += 2;
    return 0.0;
  }
}

double term() {
  double l = fact();
  for(;;) {
    if(S[ptr] == 'a') {
      // "and"
      ptr += 3;
      double r = fact();
      l = 1.0 - (1.0 - l) * (1.0 - r);
      l = (1.0 - l) * R + l * (1.0 - R);
    } else {
      break;
    }
  }
  return l;
}

double exp() {
  double l = term();
  for(;;) {
    if(S[ptr] == 'o') {
      // "or"
      ptr += 2;
      double r = term();
      l = l * r;
      l = (1.0 - l) * R + l * (1.0 - R);
    } else {
      break;
    }
  }
  return l;
}

const double eps = 1e-10;

int main() {
  cin >> N >> P >> Q >> R;
  cin >> S;
  S += "$";
  cout << int(exp() * 100 + eps) << "\n";
}