#include <iostream>
using namespace std;
const int INF = 2147483647;

int main(void) {
  int a, b, c, d, m;
  cin >> a >> b >> c >> d >> m;

  int ans = -INF;
  for (int x = a; x <= b; x++) {
    for (int y = c; y <= d; y++) {
      int num = (x + y) % m;
      if (ans < num) ans = num;
    }
  }

  cout << ans << endl;
  return 0;
}