C :

#include <stdio.h>
int main(){
	int i;
	unsigned int n,tmp;
	while (scanf("%u",&n)==1)
	{
		tmp=1;
		i=15;
		while (i--)
		{
			n&=~tmp;
			tmp<<=2;
		}
		printf("%u\n",n);
	}
	return 0;
}

C++ :

#include <stdio.h>
int main() {
	unsigned int odd(unsigned int);
	unsigned int a;
	scanf("%u", &a);
	printf("%u\n", odd(a));
	return 0;
}
unsigned int odd(unsigned int a) {
	int i;
	unsigned int result = 0;
	for (i = 1;i <= 32;i += 2)
		result = result | (a & (1 << (32 - i)));
	return result;
}