public IConvertible Solve()
{
int a = 0;
int b = 0;
if ((x + y) % 3 != 0)
{
return(0);
}
while (x + y >= 3)
{
if (x >= y)
{
x -= 2;
y -= 1;
a++;
}
else
{
y -= 2;
x -= 1;
b++;
}
}
if (x != 0 || y != 0)
{
return(0);
}
return((int)Modular.Ncr(a + b, a));
}
public static Modular Pow(Modular a, int n)
{
switch (n)
{
case 0:
return(1);
case 1:
return(a);
default:
var p = Pow(a, n / 2);
return(p * p * Pow(a, n % 2));
}
}