1 files changed, 19 insertions, 0 deletions
diff --git a/progs/a811.py b/progs/a811.py
new file mode 100644
index 0000000..2788477
--- /dev/null
+++ b/progs/a811.py
@@ -0,0 +1,19 @@
+def cal_sum(n): 
+	a = 3
+	b = 0
+	c = 2
+	if (n == 0): 
+		return 3
+	if (n == 1): 
+		return 3
+	if (n == 2): 
+		return 5
+	sum = 5
+	while (n > 2): 
+		d = a + b 
+		sum = sum + d 
+		a = b 
+		b = c 
+		c = d 
+		n = n-1
+	return sum
+\ No newline at end of file