diff --git a/pair_sum.py b/pair_sum.py
index e69de29..8659dc1 100644
--- a/pair_sum.py
+++ b/pair_sum.py
@@ -0,0 +1,11 @@
+def pairSum(list1, n):
+    if len(list1) < 2:
+        return None
+    list1.sort()
+    resultlist = []
+    for i in list1:
+        for j in list1[list1.index(i)+1:]:
+            if (i + j == n):
+                resultlist.append((i, j))
+
+    return resultlist
diff --git a/pair_sum.pyc b/pair_sum.pyc
new file mode 100644
index 0000000..0cf5c37
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..7828932
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diff --git a/tests/test_pairSum.pyc b/tests/test_pairSum.pyc
new file mode 100644
index 0000000..d0f00e1
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