#include <bits/stdc++.h>
const int maxn = 1005;
int a[maxn], dp[maxn];
int main()
{
  int a, b, c, d, m; scanf("%d %d %d %d %d", &a, &b, &c, &d, &m);
  
  int res = -1;
  for (int i = a; i <= b; i ++)
  {
    for (int j = c; j <= d; j ++)
    {
      res = std::max(res, (i + j) % m);
    }
  }
  std::cout << res << "\n";
  return 0;
}