diff --git a/18/3 - Primed for Takeoff.py b/18/3 - Primed for Takeoff.py
new file mode 100644
index 0000000..8d9bcae
--- /dev/null
+++ b/18/3 - Primed for Takeoff.py	
@@ -0,0 +1,10 @@
+isPrime = [i%2==1 for i in range(1000001)]
+isPrime[1] = False
+isPrime[2] = True
+l = len(isPrime)
+for i in range(3, l, 2):
+    if isPrime[i] == False:
+        continue
+    else:
+        for i in range(i*2, l, i):
+            isPrime[i] = False