const int d1 = 7;               
const int d2 = 8;             
const int d3 = 9;             
const int a =  12;              
const int b =  10;              
const int c =  3;             
const int d =  5;               
const int e =  6;             
const int f =  11;             
const int g =  2;              
const int h =  4;              
const int key =  13;

void setup() {
              pinMode(a, OUTPUT);                
              pinMode(b, OUTPUT);                
              pinMode(c, OUTPUT);                
              pinMode(d, OUTPUT);               
              pinMode(e, OUTPUT);                
              pinMode(f, OUTPUT);             
              pinMode(g, OUTPUT);                
              pinMode(h, OUTPUT);             
              pinMode(d1, OUTPUT);                
              pinMode(d2, OUTPUT);             
              pinMode(d3, OUTPUT);                
              pinMode(key, INPUT);               
             }

void one () // один
   { digitalWrite(b,SEGMENTS);
     digitalWrite(c,SEGMENTS);
   }

if (digitalRead(key) == LOW) {n++;}   // если нажата кнопкa
     if(n >= 20)
      { n0++;
        n = 0;
      }                    // снижаем скорость нарастания чисел(20 к 1),наш атмега слишком шустрый)))

#define ANODE  // закомментируйте или удалите, если у вас общий катод.