def METHOD_NAME(iterations):
    # Warm-up runs.
    report_energy()
    advance(0.01, 20000)
    report_energy()
    times = []
    for _ in range(iterations):
        t0 = time.time()
        report_energy()
        advance(0.01, 20000)
        report_energy()
        t1 = time.time()
        times.append(t1 - t0)
    return times