using System;

public class Test {
	public static int ContarZeros(int n) {
	    int count = 0;
	    while (n % 10 == 0) {
	        count++;
	        n /= 10;
	    }
	    return count;
	}
	
	public static void Main() {
		Console.WriteLine(ContarZeros(123000)); // esperado: 3
		Console.WriteLine(ContarZeros(102030)); // esperado: 1
	}
}