diff --git a/codility_new/max_slice_sum.py b/codility_new/max_slice_sum.py
new file mode 100644
index 0000000..58dfcf2
--- /dev/null
+++ b/codility_new/max_slice_sum.py
@@ -0,0 +1,14 @@
+# https://app.codility.com/programmers/lessons/9-maximum_slice_problem/max_slice_sum/
+
+def solution(A):
+    if len(A) == 0:
+        return 0
+    if len(A) == 1:
+        return A[0]
+    max_ending = A[0]
+    max_slice = A[0]
+    for i in range(1, len(A)):
+        a = A[i]
+        max_ending = max(a, max_ending + a)
+        max_slice = max(max_slice, max_ending)
+    return max_slice