#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>

using namespace std;

int main() {

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  //cout << fixed << setprecision(15);
  
  int a , b , c , d , m;
  cin >> a >> b >> c >> d >> m;
  if (a + c <= m && m <= b + d) cout << m - 1 << endl;
  else cout << (b + d) % m << endl;
  return 0;
}