#include<iostream>
#include<algorithm>
#include<cstring>
#include<vector>

using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
const int INF=1<<25;



int main()
{
	int a,b,c,d,m;
    int ans = 0;
    cin >> a >> b >> c >> d >> m;
    for(int x = a;x<=b;x++)for(int y = c;y<=d;y++) {
        ans = max(ans, (x+y)%m);
    }
    cout << ans << endl;
}