diff --git a/E_1351_CountNegativeNumbersinaSortedMatrix.py b/E_1351_CountNegativeNumbersinaSortedMatrix.py
new file mode 100644
index 0000000..1bd03af
--- /dev/null
+++ b/E_1351_CountNegativeNumbersinaSortedMatrix.py
@@ -0,0 +1,17 @@
+class Solution:
+    def countNegatives(self, grid: List[List[int]]) -> int:
+        def binary_search(row):
+            start, end = 0, len(row)
+            while start<end:
+                mid = start + (end-start)//2 #floor divison
+                if row[mid]<0:
+                    end = mid
+                else:
+                    start = mid+1
+            return len(row)- start
+        
+        count = 0
+        for row in grid:
+            count += binary_search(row)
+        return(count)
+        
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