#include <bits/stdc++.h>
using namespace std;
void p(double t) {
  cout << fixed << setprecision(13) << t << endl;
  exit(0);
}
struct tank {
  int hp, time, lo, hi, prob;
  void scan() {
    cin >> hp >> time >> lo >> hi >> prob;
    prob = 100 - prob;
  }
};
int moven;
vector<int> moves;
tank tanks[2];
double dp[201][201][70];
double curdp[70];
int main() {
  for (int i = 0; i < 2; i++) {
    tanks[i].scan();
  }
  if (tanks[0].prob == 0) {
    p(0);
  }
  if (tanks[1].prob == 0) {
    p(1);
  }
  for (int movet = 0; movet < tanks[0].time * tanks[1].time; movet++) {
    for (int i = 0; i < 2; i++) {
      if (movet % tanks[i].time == 0) {
        moves.push_back(i);
        moven++;
      }
    }
  }
  dp[tanks[0].hp][tanks[1].hp][0] = 1.;
  for (int i = tanks[0].hp; i > 0; i--) {
    for (int j = tanks[1].hp; j > 0; j--) {
      memset(curdp, 0, sizeof(curdp));
      double cursum = 0;
      double ratio = 1;
      for (int k = 0; k < moven; k++) {
        int cur = moves[k];
        cursum += dp[i][j][k];
        dp[i][j][k] = 0;
        curdp[k] += cursum;
        cursum *= ((100 - tanks[cur].prob) * 0.01);
        ratio *= ((100 - tanks[cur].prob) * 0.01);
      }
      for (int k = 0; k < moven; k++) {
        int cur = moves[k];
        curdp[k] += cursum / (1 - ratio);
        cursum *= ((100 - tanks[cur].prob) * 0.01);
      }
      for (int k = 0; k < moven; k++) {
        int nk = (k + 1) % moven;
        int cur = moves[k];
        double p = curdp[k] * (tanks[cur].prob * 0.01 /
                               (tanks[cur].hi - tanks[cur].lo + 1));
        if (cur == 0) {
          for (int amt = tanks[cur].lo; amt <= tanks[cur].hi; amt++) {
            dp[i][max(0, j - amt)][nk] += p;
          }
        } else {
          for (int amt = tanks[cur].lo; amt <= tanks[cur].hi; amt++) {
            dp[max(0, i - amt)][j][nk] += p;
          }
        }
      }
    }
  }
  double ans = 0;
  for (int i = 1; i <= tanks[0].hp; i++) {
    for (int k = 0; k < moven; k++) {
      ans += dp[i][0][k];
    }
  }
  p(ans);
}
