#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
    int a, b, c, d, m;
    cin >> a >> b >> c >> d >> m;
    int mx = -1;
    for(int i = a;i <= b;i++){
        for(int j = c;j <= d;j++){
            mx = max(mx, (i + j) % m);
        }
    }

    cout << mx << "\n";

    return 0;
}