diff --git a/lab19.py b/lab19.py
new file mode 100644
index 0000000..bffc59f
--- /dev/null
+++ b/lab19.py
@@ -0,0 +1,14 @@
+c0 = int(input("Inserire un numero intero positivo: "))
+passi=0
+
+while c0 > 1:
+
+    if c0 % 2 == 0:
+        c0 /= 2
+
+    else:
+        c0 = c0*3+1
+
+    passi += 1
+
+print("passi", passi)
\ No newline at end of file