diff --git a/peggy/02_calc/calc.pegjs b/peggy/02_calc/calc.pegjs
new file mode 100644
index 0000000..0ea6b86
--- /dev/null
+++ b/peggy/02_calc/calc.pegjs
@@ -0,0 +1,11 @@
+s = e
+
+e = left:t "+" right:e { return left + right; }
+    / t
+
+t = left:f "*" right:t { return left * right; }
+    / f
+
+f = _ num:[0-9]+ _ { return parseInt(num.join(""), 10); }
+
+_ = [ \t\n\r]*