diff --git a/taisformula.py b/taisformula.py
new file mode 100644
index 0000000..3af1ba5
--- /dev/null
+++ b/taisformula.py
@@ -0,0 +1,19 @@
+n = int(input())
+prev_t = 0
+prev_v = 0
+total = 0
+for i in range(n):
+    m = input().split()
+    t = int(m[0])
+    v = float(m[1])
+
+    if prev_t == 0:
+        prev_t = t
+        prev_v = v
+        continue
+
+    total += ((prev_v + v) / 2) * (t - prev_t) / 1000
+    prev_t = t
+    prev_v = v
+
+print(total)