void setup() {
  // put your setup code here, to run once:
  DDRF=0xFF;
  DDRK=0xFF;
  DDRA=0xFF;
  DDRC=0xFF;
}
void outputa(char x) {
  PORTA = x;  // Write the value of x directly to PORTA
}
void outputf(char x) {
  PORTF = x;  // Write the value of x directly to PORTA
}
void outputk(char x) {
  PORTK = x;  // Write the value of x directly to PORTA
}
void outputc(char x) {
  PORTC = x;  // Write the value of x directly to PORTA
}
void loop() {
  // put your main code here, to run repeatedly:
    int digits[11]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
   // int n,b,d;
   // n=b=d=0;
  // outputc(digits[0]);
   //for(volatile int i=0;i<100000;i++);
   for(volatile int f=0;f<6;f++)
   {
  //  if(f!=0)
    //{
    //  n=1;
   // }
    for(volatile int k=0;k<=9;k++)
    {
     // if(k!=0)
      //   b=1;
      for(volatile int a=0;a<6;a++)
      {
         // if(a!=0)
         //   d=1;
        for(volatile int c=0;c<=9;c++)
        {
         // if(n==1)
          outputf(digits[f]);
          //if(b==1)
          outputk(digits[k]);
         // if(d==1)
          outputa(digits[a]);
          outputc(digits[c]);
          for(volatile long i=0;i<100000;i++);
        }
      }
    }
   }
}