#define DELAY 300000
void setup() {
  // put your setup code here, to run once:
volatile unsigned char *dirf,*dirk;
dirf=0x30; dirk=0x107;
*dirf=0xff; *dirk=0x00;
}

void loop() {
  // put your main code here, to run repeatedly:
volatile unsigned char *outf,*ink,x;
volatile long i,p,q,r,s,m, sum=0;
outf=0x31; ink=0x106;
i=0;
  x=*ink;
  if((x&0xff)==0x01){
    *outf=0x7f;
    p=*outf;}
  else if((x&0xff)==0x02){
    *outf=0x6d;
    q=*outf;}
  else if ((x&0x0ff)==0x04){
    *outf=0x5b;
    r=*outf;}
  else if ((x&0x0ff)==0x08){
    *outf=0x47;
    s=*outf;}
    sum=p+q+r+s;
    while(sum>0){
      m=m+sum%10;
      sum=sum/10;
}
}