def calculate_transaction_fees(input_values, output_values, vsize):
    # 1. Sum all input satoshis
    total_in = sum(input_values)

    # 2. Sum all output satoshis
    total_out = sum(output_values)

    # 3. Calculate implicit fee
    fee = total_in - total_out

    print(f"--- Transaction Fee Audit ---")
    print(f"[*] Total Input Value:  {total_in:,} sats")
    print(f"[*] Total Output Value: {total_out:,} sats")
    print(f"[*] Calculated Fee:     {fee:,} sats")

    # Check for invalid transaction (outputs \u003e inputs)
    if fee \u003c 0:
        print("[ERROR] INVALID TRANSACTION: Outputs exceed inputs!")
        return

    # 4. Calculate Feerate
    feerate = fee / vsize
    print(f"[*] Virtual Size:       {vsize} vBytes")
    print(f"[*] Feerate:            {feerate:.2f} sats/vB")

    # 5. Interpretation
    if feerate \u003e 100:
        print("[STATUS] High Priority / Urgent")
    elif feerate \u003e 10:
        print("[STATUS] Standard Priority")
    else:
        print("[STATUS] Low Priority / Economy")

# --- Simulation ---

# Scenario: Spending two UTXOs to one recipient and one change address
inputs = [5000000, 2500000] # 0.075 BTC total
outputs = [7000000, 480000] # 0.07 BTC to recipient, remainder to change
vsize = 141 # Standard P2WPKH transaction size

calculate_transaction_fees(inputs, outputs, vsize)