minimum ram used, arduino

#include <Serial.h>

void setup() {
  Serial.begin(9600);
}

void loop() {
 Serial.println(freeRam());
}

int freeRam () {
  extern int __heap_start, *__brkval;
  int v;
  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}