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