void setup() {
  // put your setup code here, to run once:
pinMode (2, OUTPUT);
}
int avganka (int z, int x){
  int u=z*x;
  return u;
}



void loop() {
  // put your main code here, to run repeatedly:
  int z=20;
  int x=10;
  int u= avganka (z, x);
  if (u!=200 || x!=10){
  const int D=200;
  int a=D;
  a=a+1;
  a++;
  a+=1;
  for (int i=20; i>0; i=i-1){
digitalWrite (2, 1);
delay (a);
digitalWrite (2,0);
delay (a);
}
delay (2000);
}
}