import java.io.IOException;
import java.util.InputMismatchException;

public class Main {
	int n, m;
	int[] a;
	int max;

	void choice(int k, int[] group, int p) {
		p = Math.min(p, m - 1);
		if (n <= k) {
			if (!check(group)) {
				return;
			}
			max = Math.max(max, calc(group));
		} else {
			for (int i = 0; i <= p; i++) {
				group[k] = i;
				choice(k + 1, group, Math.max(p, i + 1));
			}
		}
	}

	boolean check(int[] group) {
		int[] cnt = new int[m];
		for (int i = 0; i < n; i++) {
			cnt[group[i]]++;
		}
		for (int i = 0; i < m; i++) {
			if (cnt[i] == 0) {
				return false;
			}
		}
		return true;
	}

	int calc(int[] group) {
		int[] sum = new int[m];
		int[] cnt = new int[m];
		for (int i = 0; i < n; i++) {
			sum[group[i]] += a[i];
			cnt[group[i]]++;
		}
		double max = 0;
		double min = 10000;
		for (int i = 0; i < m; i++) {
			double ave = 1.0 * sum[i] / cnt[i];
			max = Math.max(max, ave);
			min = Math.min(min, ave);
		}
		double diff = max - min;
		int ret = (int) Math.ceil(diff);
		return ret;
	}

	void run() {
		MyScanner sc = new MyScanner();

		n = sc.nextInt();
		m = sc.nextInt();
		a = sc.nextIntArray(n);
		max = 0;
		choice(0, new int[n], 0);
		System.out.println(max);
	}

	public static void main(String[] args) {
		new Main().run();
	}

	public void mapDebug(int[][] a) {
		System.out.println("--------map display---------");
		for (int i = 0; i < a.length; i++) {
			for (int j = 0; j < a[i].length; j++) {
				System.out.printf("%3d ", a[i][j]);
			}
			System.out.println();
		}
		System.out.println("----------------------------" + '\n');
	}

	class MyScanner {
		int read() {
			try {
				return System.in.read();
			} catch (IOException e) {
				throw new InputMismatchException();
			}
		}

		boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		boolean isEndline(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		int[] nextIntArray(int n) {
			int[] array = new int[n];
			for (int i = 0; i < n; i++)
				array[i] = nextInt();
			return array;
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		long[] nextLongArray(int n) {
			long[] array = new long[n];
			for (int i = 0; i < n; i++)
				array[i] = nextLong();
			return array;
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		double[] nextDoubleArray(int n) {
			double[] array = new double[n];
			for (int i = 0; i < n; i++)
				array[i] = nextDouble();
			return array;
		}

		String next() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		String[] nextStringArray(int n) {
			String[] array = new String[n];
			for (int i = 0; i < n; i++)
				array[i] = next();

			return array;
		}

		String nextLine() {
			int c = read();
			while (isEndline(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndline(c));
			return res.toString();
		}
	}
}