#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

int main(){
  int a,b,c,d,m;
  cin >> a >> b >> c >> d >> m;
  int ans = -1;
  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;
}