using static System.Console;
 
public class Program {
	public static void Main() {
		WriteLine(BtnSoma_Click(ReadLine(), ReadLine()));
	}
    private static string BtnSoma_Click(string txtNum1, string txtNum2) {
        if (!int.TryParse(txtNum1, out var valor1) || !int.TryParse(txtNum2, out var valor2)) {
            WriteLine("Pelo menos um dos valores é inválido");
            return null;
        }
        return (valor1 + valor2).ToString(); 
    }
}
 
//https://pt.stackoverflow.com/q/350190/101

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

MTAK

10