Create d881.py

Author: vectominist

Basic/d881.py

@@ -0,0 +1,13 @@
+import sys
+
+for s in sys.stdin:
+    num = s.split()
+    d = int(num[0])
+    a = [1]
+    b = [1]
+    ans = 1
+    for i in range(1, 50):
+        a.append(a[-1] + b[-1])
+        b.append(b[-1] + d)
+        ans += a[-1]
+    print(ans)