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#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int isPrime(int n) {
  if (n < 2) return 0;
  else if (n == 2 || n == 3) return 1;
  else{
    for (int _ = 2; _ <= sqrt(n); ++_) {
      if (n % _ == 0) return 0;
    }
    return 1;
  }
}
int main()
{
  int n;
  cin >> n;
  for (int _ = 2; _ <= n; ++_) {
    if (isPrime(_) == 1) {
      cout << _ << '\n';
    }
  }
   return 0;
}