#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;
}