1def function_that_says_ni(*args, **kwargs):
 2    valid_names = {"храст", "shrub", "bush"}
 3    total_cost = 0
 4    unique_letters = set()
 5    
 6    for arg in args:
 7        if isinstance(arg, dict) and 'name' in arg:
 8            name = arg['name'].lower()
 9            if name in valid_names:
10                cost = arg.get('cost', 0)
11                if isinstance(cost, (int, float)):
12                    total_cost += round(cost, 2)
13    
14    for name, arg in kwargs.items():
15        if isinstance(arg, dict) and 'name' in arg:
16            shrub_name = arg['name'].lower()
17            if shrub_name in valid_names:
18                cost = arg.get('cost', 0)
19                if isinstance(cost, (int, float)):
20                    total_cost += round(cost, 2)
21                unique_letters.update(name)
22
23    if total_cost > 42:
24        return "Ni!"
25    
26    int_part_cost = int(total_cost)
27    if int_part_cost == 0 or len(unique_letters) % int_part_cost != 0:
28        return "Ni!"
29    
30    return f"{total_cost:.2f}лв"