class Triangle:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c

class Triangle:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c

    def calculate_perimeter(self):
        return self.a + self.b + self.c

triangle = Triangle(3, 4, 5)
perimeter = triangle.calculate_perimeter()
print("Triangle perimeter:", perimeter)