#include <stdio.h>
#include <stdint.h>
uint32_t extract_even_bits(uint32_t reg) {
uint32_t result = 0;
int pos = 0;
// Your code here
for(int i =0;i<32;i+=2)
{
if((reg>>i&1))
{
result |= (1<<pos);
}
pos++;
}
return result;
}
int main() {
uint32_t reg;
scanf("%u", ®);
printf("%u", extract_even_bits(reg));
return 0;
}