#include<iostream>
using namespace std;
main()
{
	int a,b,c,d,m;
	cin>>a>>b>>c>>d>>m;
	int ans=-1;
	for(int x=a;x<=b;x++)for(int y=c;y<=d;y++)
	{
		int t=(x+y)%m;
		if(ans<t)ans=t;
	}
	cout<<ans<<endl;
}