#include <stdio.h>
#include <stdint.h>

#define ALERT1_CHECK (0b0001)
#define ALERT2_CHECK (0b0010)
#define ALERT3_CHECK (0b0100)
#define ALERT4_CHECK (0b1000)

int main(void) {
	uint8_t ret = 0;
	
	ret |= ALERT1_CHECK;
	ret |= ALERT2_CHECK;
	ret |= ALERT3_CHECK;
	ret |= ALERT4_CHECK;
	
	printf("%x\n", ret);
	return 0;
}