def addnumber(x,y):
    print(x+y)
def minusnumber(x,y):
    print(x-y)
def plusnumber(x,y):
    print(x*y)
def dividenumber(x,y):
    print(x/y)
addnumber(15,8)
minusnumber(15,8)
plusnumber(15,8)
dividenumber(15,8)