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


int main()
{
	int a, b, c, d, m;
	cin >> a >> b >> c >> d >> m;

	int 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;
}