import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.TreeMap;

public class Main {
	static int[] primeGap = new int[] {16, 28, 52, 84};
	static int[] factorCount = new int[] {24,24,4,16,80,12,32,16,24,12,96,8,32,4,96,2,48,16,4,80,24,16,16,8,48,32,8,2,48,8,16,16,12,4,48,8,60,24,8,8,48,4,8,16,16,4,64,8,12,32,8,2,160,4,96,12,12,4,64,6,8,16,16,24,72,4,8,16,10,16,32,16,12,16,8,4,64,32,16,32,48,8,12,2,192,4,8,8,48,16,4,24,16,8,32,6,24,32,16,4};
	void solveTestcase(final Scanner in, final PrintWriter out) {
		int n = in.nextInt();
		for (int i = 1, j = 0; ; i++) {
			if (factorCount(i) == 4) {
//				dump(++j, i);
				if (++j == n) {
					out.println(i);
					return;
				}
			}
		}
	}
	
	void solve() {
		try (final PrintWriter out = new PrintWriter(System.out)) {
			try (final Scanner in = new Scanner(System.in)) {
//				int t = in.nextInt();
				int t = 1;
				while (t-- > 0) {
					solveTestcase(in, out);
				}
			}
		}
	}

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

	// [l,r]
	boolean[] segmentSieve(long l, long r) {
		boolean[] res = new boolean[(int)(r-l+1)];
		boolean[] small = new boolean[(int)Math.sqrt(r)+1];
		Arrays.fill(res, true);
		Arrays.fill(small, true);
		if(l <= 1) res[0] = false;
		if(l <= 0) res[1] = false;
		for(int i = 2; (long)i*i <= r; i++) {
			if(small[i]) {
				if((long)i*i < small.length) {
					for(int j = i*i; j < small.length; j += i) { small[j] = false; }
				}
				{
					long v = (l + i - 1) / i * i;
					int j = (int)((v == i ? v + i : v) - l);
					for(; j < res.length; j += i) {
						res[j] = false;
					}
				}
			}
		}
		return res;
	}
	private static int factorCount(long t) {
		int res = 1;
		for(int i = 2; (long)i*i <= t; i++) {
			int cnt = 1;
			while(t % i == 0) {
				t /= i;
				cnt++;
			}
			res *= cnt;
		}
		
		if(t != 1) {
			res *= 2;
		}
		
		return res;
	}
	
	
	static void dump(Object...objects) { System.err.println(Arrays.deepToString(objects)); }
}