#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    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 << "\n";

    return 0;
}