#include <bits/stdc++.h>
#define rep(i, l, r) for (int i = (l); i < (r); i++)
using namespace std;

typedef long long ll;

int main() {
    int a, b, c, d, m, ans = 0;
    cin >> a >> b >> c >> d >> m;
    rep(x, a, b + 1) {
        rep(y, c, d + 1) {
            ans = max(ans, (x + y) % m);
        }
    }
    cout << ans << endl;
}