Answer:
The program outputs 123
Explanation:
The first line of the program initializes s1 to 20
The second line checks if s1 is less than or equal to 20.
This is true,
So, 1 is printed
The third line checks if s1 is less than or equal to 40.
This is true,
So, 2 is printed
The fourth line checks if s1 is less than or equal to 20.
This is true,
So, 3 is printed
Hence, the output is 123
