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

int main(void) {
	uint16_t raw = 0x843B ;
	uint16_t result, exponent;
	float lux;
	
	result = raw & 0x0FFF;
	exponent = (raw>>12) & 0x000F;
	
	lux=0.01*(1<<exponent)*result;
	
	printf("%f\n", lux);
	return 0;
}