const int ledm = 13, ledk = 12, ledh = 11;
const int pbm = 1, pbk = 2, pbh = 3;
void setup() {
  // put your setup code here, to run once:
pinMode(ledm, OUTPUT);
pinMode(ledk, OUTPUT);
pinMode(ledh, OUTPUT);
pinMode(pbm, INPUT_PULLUP);
pinMode(pbk, INPUT_PULLUP);
pinMode(pbh, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
int buttonm = digitalRead(pbm), buttonk = digitalRead(pbk), 
buttonh = digitalRead(pbh);
if (buttonm == LOW) {
  digitalWrite(ledm, HIGH);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, LOW);
} else if (buttonk == LOW) {
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, HIGH);
  digitalWrite(ledh, LOW);
} else if (buttonh == LOW) {
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, HIGH);
}
}