int bit1=8;
int bit2=9;
int bit3=10;
int bit4=11;
int contador=0;
void setup() {
  // put your setup code here, to run once:
pinMode(bit1, OUTPUT);
pinMode(bit2, OUTPUT);
pinMode(bit3, OUTPUT);
pinMode(bit4, OUTPUT);
pinMode(7, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
 
 //uno
 if(digitalRead(7)==HIGH){
 contador=contador+1;
 delay(1000);
 }

 if(contador==1){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }

 //dos
 if(contador==2){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }

 //Tres
 if(contador==3){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }
 
 //cuatro
 if(contador==4){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //cinco
 if(contador==5){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //seis
 if(contador==6){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //siete
 if(contador==7){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //ocho
 if(contador==8){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, HIGH);
 }

 //siete
 if(contador==9){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //seis
 if(contador==10){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //cinco
 if(contador==11){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //cuatro
 if(contador==12){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, HIGH);
 digitalWrite(bit4, LOW);
 }

 //Tres
 if(contador==13){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }

 //dos
 if(contador==14){
 digitalWrite(bit1, LOW);
 digitalWrite(bit2, HIGH);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }

 if(contador==15){
 digitalWrite(bit1, HIGH);
 digitalWrite(bit2, LOW);
 digitalWrite(bit3, LOW);
 digitalWrite(bit4, LOW);
 }

}