#include<bits/stdc++.h>
using namespace std;

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