#include "stm32c0xx.h"

int led1 = A0;
int led2 = A1;
int led3 = A2;
int led4 = A3;

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}

void loop() {
  digitalWrite(led1, HIGH);
  delay(100);
  digitalWrite(led1, LOW);

  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led2, LOW);

  digitalWrite(led3, HIGH);
  delay(100);
  digitalWrite(led3, LOW);

  digitalWrite(led4, HIGH);
  delay(100);
  digitalWrite(led4, LOW);
}