public double getProbability(String[] ratings) {
		StringBuilder builder = new StringBuilder();
		for (String string : ratings) {
			builder.append(string);
		}
		String[] split = builder.toString().split(" ");
		int[] data = new int[split.length];
		for (int i = 0; i < split.length; i++) {
			String s = split[i];
			data[i] = Integer.valueOf(s);
		}

		int mypoint = data[0];
		Arrays.sort(data);

		int N = data.length;
		int R = N / 20;
		if (N % 20 > 0) {
			R++;
		}
		int myRank = 0;
		for (int i = 0; i < N; i++) {
			if (mypoint == data[i]) {
				myRank = N - i;
				break;
			}
		}
		if (myRank == 0) {
			return 1.0;
		}
		if (myRank < R) {
			return 0;
		}
		return 1.0 / R;
	}