serial stop char array size

Hardware Arduino Due
2

this works fine...

struct fred { 
   char id[3]; 
   char msg[64];
};

fred x[2]
{
  { {"12"} , {"test message 1"}},
  { {"21"} , {"test message 2"}}  
};


void setup() 
{
  Serial.begin(9600);
  Serial.println(x[1].msg);
}

void loop() 
{

}

where are you in your overall memory usage?