#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

int main(){

    int a, b, c, d, m, ans=0;
    cin >> a >> b >> c >> d >> m;
    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;
}