1 files changed, 5 insertions, 0 deletions
diff --git a/progs/a361.py b/progs/a361.py
new file mode 100644
index 0000000..e15b5df
--- /dev/null
+++ b/progs/a361.py
@@ -0,0 +1,5 @@
+def sum_Natural(n): 
+    sum = (n * (n + 1)) 
+    return int(sum) 
+def sum_Even(l,r): 
+    return (sum_Natural(int(r / 2)) - sum_Natural(int((l - 1) / 2))) 
+\ No newline at end of file