/* 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[] idades = {15,18,15,20,16,30,18,45,43,14,25,16,20};
 
	        //contar
	        int[] contagemIdades = new int[200];
	        for (int i = 0; i < idades.length; ++i){
	            int idade = idades[i];
	            contagemIdades[idade]++;
	        }
 
	        //mostrar
	        for (int i = 0; i < contagemIdades.length; ++i) {
	            if (contagemIdades[i] >= 2){ //apenas as idades que tem mais que uma pessoa
	                System.out.printf("Existem %d pessoas com %d anos de idade\n", contagemIdades[i], i);
	            }
	        }
	}
}

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