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public static void main(String[] args) {
	int n = BinToInt("1000101");
	System.out.println(n);
}

static int BinToInt(String s) {
	int result = 0;
	for (int i = 0; i < s.length(); i++) {
		result *= 2;
		if (s.charAt(i) == '1')
			result++;
	}
	return result;
}