#include <stdio.h>
#include <stdint.h>
// Complete the function
const char* is_power_of_two(uint32_t n) {
// Your logic here
while (n != 0) {
if (n & 1) {
if ((n >> 1) == 0) return "YES";
else break;
}
n >>= 1;
}
return "NO";
}
int main() {
uint32_t n;
scanf("%u", &n);
const char* result = is_power_of_two(n);
printf("%s", result);
return 0;
}