comefrom: <doocs>1137.N-th Tribonacci Number_1.py
code: def tribonacci( n: int) -> int:
      a, b, c = 0, 1, 1
      for _ in range(n):
          a, b, c = b, c, a + b + c
      return a
masked: def sample_funcname ( var_0 : int ) -> int :
      var_1 , var_2 , var_3 = 0 , 1 , 1
      for var_4 in range ( var_0 ) :
          var_1 , var_2 , var_3 = var_2 , var_3 , var_1 + var_2 + var_3
      return var_1
  