#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>


typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;



int main()
{

    int Q;
    Q = 1;
    //cin >> Q;

    while (Q--) {
        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;
}