#include <bits/stdc++.h>
#include <vector>
#include <iostream>
#include <map>
#include <string>
#include <cmath>
#include <algorithm>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
using P = pair<int, int>;

int main() {
    
    int a,b,c,d,m;
    cin >> a >> b >> c >> d >> m;
    ll M = -1;
    
    for(int i=a; i<=b; i++) {
        for(int j=c; j<=d; j++) {
            ll p = (i+j)%m;
            M = max(M,p);
        }
    }
    
    cout << M << endl;
    
}