diff --git a/lib/misc.lua b/lib/misc.lua
new file mode 100644
index 0000000..198bf14
--- /dev/null
+++ b/lib/misc.lua
@@ -0,0 +1,9 @@
+function parseHexColor(text)
+  local r = tonumber('0x' .. string.sub(text, -8, -7))
+  local g = tonumber('0x' .. string.sub(text, -6, -5))
+  local b = tonumber('0x' .. string.sub(text, -4, -3))
+  local a = tonumber('0x' .. string.sub(text, -2))
+
+  return r, g, b, a
+end
+
diff --git a/samples/calc.lua b/samples/calc.lua
new file mode 100644
index 0000000..3034a6c
--- /dev/null
+++ b/samples/calc.lua
@@ -0,0 +1,29 @@
+
+function on_alarm()
+    ui:show_text("Введите выражение")
+end
+
+function on_click()
+    ui:show_edit_dialog("Введите выражение")
+end
+
+function on_dialog_action(text)
+    if text == "" then
+        on_alarm()
+    else
+        ui:show_text(calculate_string(text))
+    end
+end
+
+function sqrt(x)
+    return math.sqrt(x)
+end
+
+function pow(x, y)
+    return math.pow(x,y)
+end
+
+function calculate_string(str)
+    return load("return "..str)
+end 
+