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import java.math.BigInteger;
import java.util.Vector;

public class Goedel {
    private static final int CERTAINTY = 24;
    public static void main(String[] args) throws Exception {
        Vector<BigInteger> primes = new Vector<BigInteger>();
        for (int i = 2; primes.size() < args[0].length(); i++) {
            BigInteger bi = BigInteger.valueOf(i);
            if (bi.isProbablePrime(CERTAINTY)) primes.add(bi);
        }
        BigInteger result = BigInteger.ONE;
        for (int i = 0; i < args[0].length(); i++)
            result = result.multiply(primes.get(i).pow(Integer.valueOf(args[0].substring(i,i+1))));
        System.out.println(result);
    }
}