#include <bits/stdc++.h>
using namespace std;

int main() {
  int a, b, c, d, m;
  int ans = 0;
  cin >> a >> b >> c >> d >> m;
  for (int x = a; x <= b; x++) {
    for (int y = c; y <= d; y++) {
      ans = max(ans, (x + y) % m);
    }
  }
  cout << ans << endl;
}