#include <stdio.h>
#include <stdint.h>
// Complete the function
const char* is_power_of_two(uint32_t n) {
// Your logic here
uint8_t cnt = 0;
while(n)
{
if(n&1)
cnt++;
if(cnt > 2)
return "NO";
n = n>>1;
}
if(cnt == 1)
return "YES";
return "NO";
}
int main() {
uint32_t n;
scanf("%u", &n);
const char* result = is_power_of_two(n);
printf("%s", result);
return 0;
}