#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
#define rep(i,n) for(int i=0; i<n; ++i)

int 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 tmp = (x + y) % m;
            ans = max(ans, tmp);
        }
    }

    cout << ans << endl;

    return 0;
}