void setup() {
  volatile char *dir=0x30;
  volatile char *outf=0x31;
  volatile char x;
  volatile long i,j;
  volatile char *inputk=0x106;

*dir=0xff;
dir=0x107;
*dir=0x00;
i=0;
while(1)
{
x=*inputk;

if(x&0x01==0x01){
i++;

for(j=0;j<100000;j++);
}

if(i%2==0)
  *outf=1;
  else 
  *outf=2;
}

}

void loop() {
  // put your main code here, to run repeatedly:

}