diff --git a/code b/code
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+++ b/code
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+
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract BasicMath {
+    function adder(uint _a, uint _b) external pure returns (uint sum, bool error) {
+        unchecked {
+            uint result = _a + _b;
+            if (result >= _a && result >= _b) {
+                return (result, false);
+            } else {
+                return (0, true);
+            }
+        }
+    }
+
+    function subtractor(uint _a, uint _b) external pure returns (uint difference, bool error) {
+        unchecked {
+            if (_b <= _a) {
+                return (_a - _b, false);
+            } else {
+                return (0, true);
+            }
+        }
+    }
+}