#include <iostream>
using namespace std;


int main() {
	int a, b, c, d, m; cin >> a >> b >> c >> d >> m;
	
	int res = 0;
	for (int x = a; x < b + 1; x++) {
		for (int y = c; y < d + 1; y++) {
			int tmp = (x + y) % m;
			if (tmp > res) res = tmp;
		}
	}
	cout << res << endl;
	
	return 0;
}