int sum(int,int );

void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
}
void loop() {
  // put your main code here, to run repeatedly:
int r=0;
r =sum(56,78);
Serial.print(r);
}
int sum(int x,int y){
  int z=0;
  z=x+y;
  Serial.print(z);
  return z;
}