change in stamina

Additional stamina based on the grade of the shoes

Shoe Grade	stamina
Rare	+5
Epic	+10
Unique	+15
Legend	+20

The change in stamina based on the number of shoes

No. of shoes	stamina
1	10
2	12
3	20
4	21
5	22
6	24
7	25
8	27
9	45
10	46
11	47
12	48
13	49
14	50
15	60
16	62
17	64
18	65
19	66
20	68
21	69
22	70
23	71
24	72
25	73
26	74
27	75
28	77
29	80
30	100
31	101
32	102
33	103
34	104
35	105
36	106
37	107
38	108
39	109
40	115
41	116
42	117
43	118
44	119
45	120
46	121
47	122
48	123
49	124
50	130
51	131
52	132
53	133
54	134
55	135
56	136
57	137
58	138
59	139
60	150
61 or higher	+2 per shoe

e.g. A user who owns 2 Normal shoes and 1 Rare shoe has a total of 3 shoes and 20 stamina. They also own 1 Rare shoe, so they get an additional +5 stamina for a total of 25 stamina.