Task: Program Execution
Input (English): [-18, 6, 78, 56, 73, 81, -17, -52, -22, -42, -55, -73, 28]
Output (English): [-6.0, 42.0, 67.0, 64.5, 77.0, 32.0, -34.5, -37.0, -32.0, -48.5, -64.0, -22.5]