#include <stdio.h>
#include <stdint.h>
// Complete the function
const char* is_power_of_two(uint32_t n) {
// Your logic here
uint32_t count=0;
if ( n == 0)return "NO";
for ( int i = 0;i<32;i++){
if(n & (1 << i)){
count++;
}
}
if( count == 1)return "YES";
else return "NO";
}
int main() {
uint32_t n;
scanf("%u", &n);
const char* result = is_power_of_two(n);
printf("%s", result);
return 0;
}