From c05cd4986ea0eec5ce505b5a3fe1d00fe24af093 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ata=20Deniz=20Ayd=C4=B1n?=
 <meagtan@users.noreply.github.com>
Date: Tue, 16 May 2017 01:38:57 +0300
Subject: [PATCH]

---
 modp.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modp.py b/modp.py
index aa886eb..1523609 100644
--- a/modp.py
+++ b/modp.py
@@ -11,6 +11,8 @@ class ModP(int):
         return "%d %% %d" % (self, self.p)
     
     # arithmetic
+    def __neg__(self):
+        return ModP(self.p, self.p - int(self))
     def __add__(self, other):
         return ModP(self.p, int(self) + int(other))
     def __radd__(self, other):