text: #include <stdio.h>
  
  inline int f(long long x) {
      long long t = 1;
      while (x > t)
          t <<= 1;
      if (x == t)
          return 0;
      return 1;
  }
  
  int main() {
  #ifndef ONLINE_JUDGE
      freopen("1.in", "r", stdin);
      freopen("1.out", "w", stdout);
      freopen("1.err", "w", stderr);
  #endif
      long long x;
      scanf("%lld", &x);
      if (f(x))
          printf("%lld不是2的幂",x);
      else
          printf("%lld是2的幂",x);
  #ifndef ONLINE_JUDGE
      fclose(stdin);
      fclose(stdout);
      fclose(stderr);
  #endif
      return 0;
  }