#include <bits/stdc++.h>

using namespace std;

int main() {
    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((i+j)%m, ans);
        }
    }

    cout << ans << endl;

    return 0;
}