<gh_stars>0

def Sum(x,y):
    return x+y
def Sub(x,y):
    return x-y
def Mul(x,y):
    return x*y
def Div(x,y):
    if(y>0):
      return x/y

def Sum(x,y):
    return x+y
def Sub(x,y):
    return x-y
def Mul(x,y):
    return x*y
def Div(x,y):
    if(y>0):
      return x/y