```python
def list_cost(kind: str) -> int:
    # This function is not relevant to the current task and will not be implemented.
    pass

def list_toll(steps: list[str]) -> int:
    if not steps:
        return 0
    
    total_cost = 0
    for i,        if (i + 1) % 3 != 0:
            continue
        total_cost += 1
    
    return total_cost
```