#include <bits/stdc++.h>
using namespace std;
int main() {
    // Input
    int a, b, c, d, m;
    cin >> a >> b >> c >> d >> m;

    // All Search
    int ans = 0;
    for (int x = a; x <= b; ++x) {
        for (int y = c; y <= d; ++y) {
            ans = max(ans, (x + y) % m);
        }
    }

    // Output
    cout << ans << endl;
}