diff --git a/legrandchien.py b/legrandchien.py
new file mode 100644
index 0000000..056b0da
--- /dev/null
+++ b/legrandchien.py
@@ -0,0 +1,69 @@
+from enum import Enum
+import numpy as np
+
+class Operation(Enum):
+    VAR = 1
+    CONST = 2
+    ADD = 3
+    SUB = 4
+    MULT = 5
+    DIV = 6
+    EXP = 7
+
+# const class
+class Const:
+    def __init__(self, value) -> None:
+        self.value = value
+        self.type = "Const"
+
+    def __add__(self, other):
+        if other.type == "Const":
+            return Equation(
+                Operation.CONST,
+                None,
+                None,
+                self.value
+            ) + Equation(
+                Operation.CONST,
+                None,
+                None,
+                other.value
+            )
+        if other.type == "Var":
+            return Equation(
+                Operation.CONST,
+                None,
+                None,
+                self.value
+            ) + Equation(
+                Operation.VAR,
+                None,
+                None,
+                other.name
+            )
+        if other.type == "Equation":
+            return Equation(
+                Operation.CONST,
+                None,
+                None,
+                self.value
+            ) + other
+
+# var class
+class Var:
+    def __init__(self, name) -> None:
+        self.name = name
+        self.type = "Var"
+
+# equation class
+class Equation:
+    def __init__(self, op, left, right, value):
+        self.op = op
+        self.left = left
+        self.right = right
+        self.value = value
+        self.type = "Equation"
+
+    def __add__(self, other):
+        if other.type == "Equation":
+            return Equation(Operation.ADD, self, other, None)
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..0a8f06e
--- /dev/null
+++ b/main.py
@@ -0,0 +1,7 @@
+from legrandchien import *
+
+if __name__ == "__main__":
+    k = Const(3)
+    kk = Const(4)
+
+    eq = k + kk