class MyMath:
    def isEven(num):
        if(num%2==0):
            return True
        return False
    
    def isOdd(num):
        if(num%2==0):
            return False
        return True
    
    def isPrime(num):
        for i in range(2,num):
            if(num%i==0):
                return False
        return True
    
class Calci:
    def add(n1,n2):
        return n1+n2
    
    def sub(n1,n2):
        return n1-n2
    
    def mul(n1,n2):
        return n1*n2