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

#ifdef LOCAL
#include "debug.hpp"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  ll A, B; cin >> A >> B;
  ll C, D; cin >> C >> D;
  ll M; cin >> M;
  ll ans = 0;
  for (ll i = A; i <= B; i++) {
    for (ll j = C; j <= D; j++) {
      ans = max(ans, (i + j) % M);
    }
  }
  cout << ans << '\n';
  return 0;
}