#include <algorithm>
#include <iostream>
using namespace std;

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