#include<stdio.h>
int main()
{
	int a, b, c, d, m;
	scanf("%d %d %d %d %d", &a, &b, &c, &d, &m);
	int ans = 0, x, y;
	for (x = a; x <= b; x++)
		for (y = c; y <= d; y++)
			if (ans < (x + y) % m)
				ans = (x + y) % m;
	printf("%d\n", ans);
	return 0;
}