#include <stdio.h>
#include <stdint.h>
// Complete the function
const char* is_power_of_two(uint32_t n) {
// Your logic here
int count=0,value;
while(n!=0)
{
value=n&1;
n>>=1;
if(value==1)
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;
}