#include <stdio.h>
#include <stdint.h>
uint8_t set_range(uint8_t reg, uint8_t start, uint8_t end) {
// Your code here
int temp=0;
for(uint8_t i=start;i<=end;i++)
{
temp= 1<<i;
reg = reg|temp;
}
return reg;
}
int main() {
uint8_t reg, start, end;
scanf("%hhu %hhu %hhu", ®, &start, &end);
printf("%u", set_range(reg, start, end));
return 0;
}