#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
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((i+j)%m, ans);
    }
  }
  cout << ans << endl;
  return 0;
}