#include <bits/stdc++.h>
using namespace std;
const double EPS = 1e-12;
double number(string &S, int &p, double P, double Q, double R);
double factor(string &S, int &p, double P, double Q, double R);
double term1(string &S, int &p, double P, double Q, double R);
double term2(string &S, int &p, double P, double Q, double R);
double expression(string &S, int &p, double P, double Q, double R);
double number(string &S, int &p, double P, double Q, double R){
  if (S[p] == 'Y'){
    p++;
    return 1;
  } else {
    p++;
    return 0;
  }
}
double factor(string &S, int &p, double P, double Q, double R){
  if (S[p] == '('){
    p++;
    double ans = expression(S, p, P, Q, R);
    p++;
    return ans;
  } else {
    return number(S, p, P, Q, R);
  }
}
double term1(string &S, int &p, double P, double Q, double R){
  if (S[p] == 'r'){
    p += 2;
    double x = expression(S, p, P, Q, R);
    double y = expression(S, p, P, Q, R);
    p++;
    return x * y * P + (1 - x * y) * Q;
  } else {
    return factor(S, p, P, Q, R);
  }
}
double term2(string &S, int &p, double P, double Q, double R){
  double ans = term1(S, p, P, Q, R);
  while (1){
    if (S[p] == 'a'){
      p++;
      double tmp = term1(S, p, P, Q, R);
      ans = ans * tmp * (1 - R) + (1 - ans * tmp) * R;
    } else {
      break;
    }
  }
  return ans;
}
double expression(string &S, int &p, double P, double Q, double R){
  double ans = term2(S, p, P, Q, R);
  while (1){
    if (S[p] == 'o'){
      p++;
      double tmp = term2(S, p, P, Q, R);
      ans = (1 - (1 - ans) * (1 - tmp)) * (1 - R) + (1 - ans) * (1 - tmp) * R;
    } else {
      break;
    }
  }
  return ans;
}
int main(){
  int N;
  cin >> N;
  double P, Q, R;
  cin >> P >> Q >> R;
  string S;
  cin >> S;
  string T;
  for (int i = 0; i < N; i++){
    char c = S[i];
    T += c;
    if (c == 'o'){
      i++;
    }
    if (c == 'a'){
      i += 2;
    }
    if (c == 'r'){
      i += 5;
    }
    if (c == 'Y'){
      i += 2;
    }
    if (c == 'N'){
      i++;
    }
  }
  T += '$';
  int p = 0;
  double ans = expression(T, p, P, Q, R);
  cout << (int) (ans * 100 + EPS) << endl;
}