Task: Program Execution
Input (English): [18, 15, -47, -18, -12, 52, 77, 36, -63, -2, 31, 74, 59]
Output (English): [16.5, -16.0, -32.5, -15.0, 20.0, 64.5, 56.5, -13.5, -32.5, 14.5, 52.5, 66.5]