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The sum of three natural numbers in a math problem is 13, and the three natural numbers are different from each other. How many situations can there be?
0: 6 species ((0, 1, 12) (0, 2,1) (0, 3, 10) (0, 4, 9) (0, 5,

1:5 species ((1, 2, 10) (1, 3,9) (1,4,8) (1,5,7))

2.3 species ((2,3,8) (2,4,7)) (2,5,6))

3: 1(3,4,6)

*** 15 species

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