#include <stdio.h>
#include <stdint.h>
uint32_t extract_even_bits(uint32_t reg) {
// Your code here
uint32_t pos = 0;
uint32_t new_reg = 0;
for(int i = 0; i<=31 ; i=i+2){
uint32_t bit = (reg >> i) & 1U;
new_reg |= (bit<<pos);
pos++;
}
return new_reg;
}
int main() {
uint32_t reg;
scanf("%u", ®);
printf("%u", extract_even_bits(reg));
return 0;
}