/* 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
	{
		String[][] array = { { "Dublin", "NYC"}, { "Moscow", "Los-Angeles"}, { "London", "Paris" }};
		Map<String, String> map = new HashMap<String, String>();
 
		//Then loop over the array
		for(int i=0;i<array.length;i++){
		 map.put(array[i][0], array[i][1]);
		}
		System.out.println(map.size());
	}
}

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