#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define srep(i,a,b) for(int i = a; i < b; i++)
#define all(A) (A).begin(),A.end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using P = pair<char,int>;
using Graph = vector<vector<int>>;

int main(void){
	int a,b,c,d,m; cin >> a >> b >> c >> d >> m;
	int M = 0;
	srep(x,a,b+1){
		srep(y,c,d+1){
			M = max(M,(x+y)%m);
		}
	}
	cout << M;
}