Task: Program Execution
Input (English): [-10, -30, -57, 31, 84, 71, 83, 75, -30, -36, 3, 48, -17, 56, -50]
Output (English): [-20.0, -43.5, -13.0, 57.5, 77.5, 77.0, 79.0, 22.5, -33.0, -16.5, 25.5, 15.5, 19.5, 3.0]