#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

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;
	
	return 0;
}