save project

a.py

+def a(n):
+    if n<=2:
+        return 1
+    elif n>2:
+        n=a(n-1)+a(n-2)
+        return n
+num=0
+n=0
+while num<20:
+    n+=1
+    num=a(n)
+print(n)
\ No newline at end of file