diff --git a/.vscode/settings.json b/.vscode/settings.json
index e112a70..62fe69d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -3,5 +3,9 @@
     "java.project.outputPath": "bin",
     "java.project.referencedLibraries": [
         "lib/**/*.jar"
+    ],
+    "cSpell.words": [
+        "complexite",
+        "Poignee"
     ]
 }
diff --git a/bin/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.class b/bin/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.class
index ef890c2..60ae7d3 100644
Binary files a/bin/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.class and b/bin/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.class differ
diff --git a/src/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.java b/src/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.java
index d7b13d3..5da31e4 100644
--- a/src/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.java
+++ b/src/C10_Tri_et_complexite/C102_Complexite_algorithmique/Poignee_de_main.java
@@ -1,7 +1,24 @@
 package C10_Tri_et_complexite.C102_Complexite_algorithmique;
 
+// Nombre de poignées de mains échangées pour n personnes.
 public class Poignee_de_main {
+
     public static void main(String[] args) throws Exception {
-        System.out.println("Hello, World!");
+        new Poignee_de_main(10);
     }
+
+    private int n;
+    private long checks = 0;
+
+    Poignee_de_main(int n){
+        this.n = n;
+        compute();
+        System.out.println("Poignées de mains échangée: " + checks);
+    }
+
+	private void compute() {
+        for (int i = n-1; i >= 1; i--) {
+            checks += i;
+        }
+	}
 }