笨拙的牛电脑 - Problem

#22575. 笨拙的牛电脑

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牛不熟悉数字技术，本想建使用二进制（基数2）的计算机器（没错，是 cowmpouter），却建成基数 -2 的！她们很高兴，因为 -2 进制没有符号位。

-2进制从右到左位权为1,-2,4,-8,16,-32，依此类推。从1开始计数为1,110,111,100,101,11010,11011,11000,11001，等等。负数也仅用1和0，无符号。从-1递减为11,10,1101,1100,1111，等等。

请把普通十进制整数转为-2进制。

输入格式

一个整数，范围-2,000,000,000..2,000,000,000。

输出格式

输入整数的-2进制表示，无前导零。0恰好输出0。

样例

输入格式 1

-13

输出格式 1

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