diff --git a/fadingwind.py b/fadingwind.py
new file mode 100644
index 0000000..a122027
--- /dev/null
+++ b/fadingwind.py
@@ -0,0 +1,17 @@
+h, k, v, s = map(int, input().split())
+travel = 0
+while h > 0:
+    v += s
+    v -= max(1, v // 10)
+    if v >= k:
+        h += 1
+    if 0 < v < k:
+        h -= 1
+    if h == 0:
+        v = 0
+    if v <= 0:
+        h, v = 0, 0
+    travel += v
+    if s > 0:
+        s -= 1
+print(travel)