当输入为“64”时，执行完第5行后x的值为()

假设输入的x是不超过65535的自然数，完成下面的判断题和单选题

#incTude <iostream>
using namespace std;

unsigned short f(unsigned short x) {
		x ^=x << 6;
     x ^=x >> 8;
		return x;
}

int main() {
		unsigned short x;
		cin >> x;
		unsigned short y = f(x);
		cout << y << end1;
		return 0;
}