diff --git a/E_1207_UniqueNumberofOccurrences.py b/E_1207_UniqueNumberofOccurrences.py
new file mode 100644
index 0000000..95447b4
--- /dev/null
+++ b/E_1207_UniqueNumberofOccurrences.py
@@ -0,0 +1,4 @@
+class Solution:
+    def uniqueOccurrences(self, arr: List[int]) -> bool:
+        count = collections.Counter(arr)
+        return len(count) == len(set(count.values()))
\ No newline at end of file