/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
static final int MAX=100;
 
	public static void main(String[] args) throws NumberFormatException, IOException {
 
 
		sievedPrime();
	}
 
 
	private static void sievedPrime(){
		int root=(int) Math.sqrt(MAX)+1;
		int limit=(MAX-1)/2;
		boolean[] isPrime=new boolean[limit];
		Arrays.fill(isPrime, true);
		root = root/2 -1;
		for(int i = 0; i < root ; i++){
			if(isPrime[i]){
				for( int j = 2*i*(i+3)+3 , p = 2*i+3; j < limit ; j=j+p ){
					isPrime[j]=false;
				}
			}
		}
 
		for(boolean b: isPrime)System.out.print(b);
	}
}

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