#include <bits/stdc++.h>
int Pos(int a) {
  if (a < 0) {
    return 0;
  }
  return a;
}
int main() {
  int n = 0, p1 = 0, t1 = 0, p2 = 0, t2 = 0, p3 = 0;
  int energy = 0;
  std::vector<int> timeDatal;
  std::vector<int> timeDatar;
  std::cin >> n >> p1 >> p2 >> p3 >> t1 >> t2;
  for (int i = 0; i < n; i++) {
    int input;
    std::cin >> input;
    timeDatal.push_back(input);
    std::cin >> input;
    timeDatar.push_back(input);
    energy += p1 * (timeDatar[i] - timeDatal[i]);
    if (i != 0) {
      int delta = timeDatal[i] - timeDatar[i - 1];
      if (delta - t1 >= 0) {
        energy += t1 * p1;
      } else if (delta >= 0) {
        energy += delta * p1;
      }
      delta -= t1;
      if (delta - t2 >= 0) {
        energy += t2 * p2;
      } else if (delta >= 0) {
        energy += delta * p2;
      }
      delta -= t2;
      if (delta > 0) {
        energy += p3 * delta;
      }
    }
  }
  std::cout << energy;
}
