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