diff --git a/ex5.py b/ex5.py
index eb6496e..1417a14 100644
--- a/ex5.py
+++ b/ex5.py
@@ -29,3 +29,28 @@ def interpolation_newton(points: list[Point], x: float) -> float:
             a_i *= (points[k+1].y - points[k].y) / (points[k+1].x - points[k].x)
 
     return interpolation
+
+
+def ex1() -> None:
+    p1 = Point(-1, 0)
+    p2 = Point(0, -1)
+    p3 = Point(1, 0)
+    p4 = Point(3, 70)
+
+    points = []
+    points.append(p1)
+    points.append(p2)
+    points.append(p3)
+    points.append(p4)
+
+    """
+    
+    """
+
+    racine_x_2 = interpolation_lagrange(points, 2.0)
+    racine_x_3 = interpolation_lagrange(points, 3.0)
+    print(f'racine X = 2 = {racine_x_2}, racine X = 3 = {racine_x_3}')
+
+
+if __name__ == '__main__':
+    ex1()