#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

int main() {
    int a, b, c, d, m;
    cin >> a >> b >> c >> d >> m;

    int ma = 0;
    for (int i = a; i <= b; i++) {
        for (int j = c; j <= d; j++) {
            ma = max(ma, (i + j) % m);
        }
    }

    cout << ma << endl;

    return 0;
}