/* 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
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int[] nums={1,2,3};
		Set<Integer> set= new HashSet<>();
		for(int num:nums){
			if(set.contains(num)){
				System.out.println("true");
				return;
			}
			set.add(num);
		}
		System.out.println("false");
	}
}

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