int i=0,k=0,j;
int s[6];
int sum,sum1,sum2,dishu;
void setup() {
for (i=0;i<=5;i++){
  s[i]=0;
}
pinMode(13, INPUT);
pinMode(12, INPUT);
pinMode(11, INPUT);
pinMode(10, INPUT);
for (i=16;i<=21;i++){
  pinMode(i, OUTPUT);
}
}

void loop() {
  while (digitalRead(13)==0){
  }
  digitalWrite(16, LOW);
  digitalWrite(17, LOW);
  digitalWrite(18, LOW);
  for (i=0;i<=2;i++){
    s[i]=0;
  }
  delay(300);
  while (digitalRead(13)==0){
    if (digitalRead(12)==1){
      digitalWrite(16,(s[0]+1)%2);
      delay(300);
      s[0]=(s[0]+1)%2;
    }
    if (digitalRead(11)==1){
      digitalWrite(17,(s[1]+1)%2);
      delay(300);
      s[1]=(s[1]+1)%2;
    }
    if (digitalRead(10)==1){
      digitalWrite(18,(s[2]+1)%2);
      delay(300);
      s[2]=(s[2]+1)%2;
    }
  }
  digitalWrite(19, LOW);
  digitalWrite(20, LOW);
  digitalWrite(21, LOW);
  for (i=3;i<=5;i++){
    s[i]=0;
  }
  delay(300);
  while (digitalRead(13)==0){
    if (digitalRead(12)==1){
      digitalWrite(19,(s[3]+1)%2);
      delay(300);
      s[3]=(s[3]+1)%2;
    }
    if (digitalRead(11)==1){
      digitalWrite(20,(s[4]+1)%2);
      delay(300);
      s[4]=(s[4]+1)%2;
    }
    if (digitalRead(10)==1){
      digitalWrite(21,(s[5]+1)%2);
      delay(300);
      s[5]=(s[5]+1)%2;
    }
  }
  sum1 = s[0] + s[1] * 2 + s[2] * 4;
	sum2 = s[3] + s[4] * 2 + s[5] * 4;
	sum = sum1 * sum2;
		for (k = 5; k >= 0; k--) {
			dishu = 1;
			for (j = 1; j <= k; j++) {
				dishu = dishu * 2;
			}
			if (sum>=dishu){
        s[k]=1;
      }
      else{
        s[k]=0;
      }
			sum = sum - dishu * s[k];
		}
  for (k=0;k<=5;k++){
    digitalWrite(16+k,s[k]);
  }
  delay(300);
}