diff --git a/grassseed.py b/grassseed.py
new file mode 100644
index 0000000..a7d1683
--- /dev/null
+++ b/grassseed.py
@@ -0,0 +1,12 @@
+import sys
+
+c = float(sys.stdin.readline())
+l = int(sys.stdin.readline())
+
+ans = 0.0
+
+for _ in range(l):
+    width, length = sys.stdin.readline().split(' ')
+    ans += c * float(width) * float(length)
+
+print(ans)