#include <bits/stdc++.h>
using namespace std;
vector<long> v;
long lll(long n, long i) {
  long x = 1;
  while (1) {
    if (pow(i, x) > n) return x - 1;
    v.push_back(pow(i, x));
    x++;
  }
}
int main() {
  long ara[] = {2,   3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,
                43,  47,  53,  59,  61,  67,  71,  73,  79,  83,  89,  97,  101,
                103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167,
                173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239,
                241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313,
                317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397,
                401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467,
                479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569,
                571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643,
                647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733,
                739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823,
                827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911,
                919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997};
  long n, sum = 0;
  cin >> n;
  for (long i = 0; i < 168; i++) {
    sum += lll(n, ara[i]);
  }
  cout << sum << endl;
  for (auto x : v) cout << x << " ";
}
