#include <stdio.h>
#include <stdint.h>
uint8_t clear_bit(uint8_t *reg, uint8_t *pos) {
// Your code here
return *reg&(~(255&(1<<*pos)));
}
int main() {
uint8_t reg, pos;
scanf("%hhu %hhu", ®, &pos);
uint8_t result = clear_bit(®, &pos);
printf("%u", result);
return 0;
}