class Steel():
    def __init__(self,a):
        self.steeltype = a[0]
        self.thickness = a[1]
        self.density = a[2]
        self.a = a[3]
        if len(a)==5:
            self.b = a[4]

    def S(self):
        if self.steeltype==1:
            s=self.a*self.a
        if self.steeltype==2:
            s=self.a*b
        if self.steeltype==3:
            s=(self.a*b)/2
        return s

    def weight(self):
        weigh=(Steel.S(self)*0.001)*self.thickness*self.density
        return weigh

    def INFO(self):
        print(self.steeltype,self.thickness,self.density,Steel.S(self),Steel.weight(self))


omega=[[1,2,7800,4],
       [2,3,7670,4,3],
       [3,2,7745,6,5],
       [1,5,8000,6],
       [3,2,7640,5,8],
       [1,1,8170,3],
       [2,6,7900,2,3],
       [1,3,8100,],
       [1,4,],
       [3,],
       [2,],
       [2,],
       [2,],
       [2,],
       [2,]]
d=Steel(omega[0])
print(d.S())
print(d.weight())
d.INFO()