Multiple Interface with same method signature

public interface ISum1
{
    int Sum(int a, int b);
}

public interface ISum2
{
    int Sum(int a, int b);
}
public class MainClass : ISum1, ISum2
{
    int ISum1.Sum(int a, int b)
    {
        
        return a + b;
    }
    int ISum2.Sum(int a, int b)
    {
        return a * b;
    }
}
public class Test
{
    
    public void  TestMethod()
    {
        int result;
        ISum1 is1 = new MainClass();
        result = is1.Sum(2,3);
        ISum2 is2 = new MainClass();
        result = is2.Sum(2,3);

       
    }


}