> And if I use Scanner there is nothing happened
> But Scanner take so many time that I got tle.
can use this function
static int ni() {
		int v = 0;
		char t = 0;
		boolean neg = false;
		try {
			while (!Character.isDigit(t = (char) System.in.read()) && t != '-')
				;
			if (t == '-') {
				neg = true;
				t = '0';
			}
			do {
				v *= 10;
				v += t - '0';
			} while (Character.isDigit(t = (char) System.in.read()));
		} catch (Exception e) {
		}
		return neg ? -v : v;
	}