#include <iostream>
using namespace std;

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