#include<algorithm>
#include<iostream>
#include<vector>
#include<map>
#include<cassert>
#include<set>
#include<queue>
using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    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;
}