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


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

}