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

public class Main {
	int n;
	boolean[] vis;
	long[][] dist;

	boolean dfs(int k, long ub) {
		if (k == n - 1) {
			return true;
		}
		if (vis[k]) {
			return false;
		}
		vis[k] = true;
		for (int i = 0; i < n; i++) {
			if (i == k) {
				continue;
			}
			if (ub < dist[k][i]) {
				continue;
			}
			if (dfs(i, ub)) {
				return true;
			}
		}
		return false;
	}

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

		n = sc.nextInt();
		long[] x = new long[n];
		long[] y = new long[n];
		for (int i = 0; i < n; i++) {
			x[i] = sc.nextLong();
			y[i] = sc.nextLong();
		}
		dist = new long[n][n];
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				long len = Math.abs(x[i] - x[j]) * Math.abs(x[i] - x[j])
						+ Math.abs(y[i] - y[j]) * Math.abs(y[i] - y[j]);
				dist[i][j] = dist[j][i] = len;
			}
		}

		vis = new boolean[n];
		int low = 0, high = 1_000_000_000 + 10;
		while (low + 1 < high) {
			Arrays.fill(vis, false);
			int mid = (low + high) / 2;
			if (dfs(0, 100L * mid * mid)) {
				high = mid;
			} else {
				low = mid;
			}
		}
		System.out.println((low + 1) * 10);
	}

	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();
		}
	}
}