import sys 

class out(object):
    def __lshift__(self, x): 
        sys.stdout.write(str(x))
        return self

class std(object):
    cout = out()
    endl = '\n'

x = 0 
def f():
    global x
    x += 1
    return x

std.cout << f() << std.endl << f() << std.endl << f() << std.endl