#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); ++i)

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