auto save

w.py

+#))a 
+#if sb%2:
+#   print("no")
+#else:
+#    print("yes")
+a=int(input("购物"))
+if a==1:
+    print(3)
+if a==2:
+  print(10)
+if a==3:
+  print(20)
+if a>=4:
+  print(45)
+    
+
+    
+
+    
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