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

int main() {
  int a, b, c, d, e;
  int count =0;
  cin >> a>>b>>c>>d>>e;
  for(int i=min(a,b); (min(a,b)<=i)&&(i<=max(a, b)); i++){
     if(e-1==count){
     break;
     }
   for(int j=min(c,d); (min(c,d)<=j)&&(j<=max(c,d));j++){
     int f = (i + j) % e;
     count = max(f, count);
     if(e-1==count){
       break;
     }
   }
  }
  cout << count;
}