catalogue = {'hot-dot':50,'hamburger':120,'shaurma':150,'naggets':130,'piza':930,
             'boso-lagman':250,'plov':190,'giro-lagman':240,'mantes':160,'rolls':600,
             'garnir':100,'grechka':70,'pelmeni':130,'french meat':400,'fish':500,
             't-bone':870,'Beijing duck':5000,'shashlyk assorti':50000
             }
def auth(username,password)
    if
