задача 4

print("треба", sum(divmod(int(input()), 2)) ,"парт")

задача 1

print(int(input("a = "))*int(input("b = ")))

задача 2

```

def expression(

   x:float=None,

   z:float=None,

   *args, **kwargs

   ) -> float:

   if x == None:

       raise "x not number"

   if z == None:

       raise "z not number"

   return 24*z+(7*x*z**2-z/3*z*x)

if __name__ == "__main__":

   x = int(input())

   z = int(input())

   print(expression(x=x, z=z))

```

задача 3

print(sum([int(input(f"{i} = ")) for i in ['x', 'y', 'z']]))