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

using std::cin; 
using std::cout;
using std::max;
using std::vector;
using vi = vector<int>;
using vvi = vector<vi>;

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) {
			int t = (x + y) % m;
			ans = max(ans, t);
		}
	}
	
	cout << ans << '\n';
	
	return 0;
}