#define concat(a,b,x,y)  a##b(x,y,a,b);
#define bla(a,b,x,y)     a##b(x,y,a,b);

int (bla)(int a, int b, int c, int d) {
	return a + b + c + d;
}

int main()
{
	int con = 0;
	int cat = 0;
	int b = 0;
	int la = 0;
	return bla(con,cat,b,la);
}