#include <algorithm>
#include <array>
#include <cstddef>
#include <cstdio>
#include <vector>

int main() {
  using usize = std::size_t;
  const auto chmin = [](usize &a, const usize b) {
    if (b < a) {
      a = b;
    }
  };
  static constexpr usize ALim = 300001;
  std::vector<usize> prime;
  {
    std::array<bool, ALim> sieve = {};
    usize i = 2;
    for (; i * i <= ALim; ++i) {
      if (!sieve[i]) {
        prime.push_back(i);
        for (usize j = i * i; j < ALim; j += i) {
          sieve[j] = true;
        }
      }
    }
    for (; i < ALim; ++i) {
      if (!sieve[i]) {
        prime.push_back(i);
      }
    }
  }

  usize n;
  std::scanf("%zu", &n);
  std::vector<usize> a(n);
  std::array<usize, ALim> dp, exc;
  std::fill(dp.begin(), dp.end(), n);
  for (usize i = 0; i != n; ++i) {
    std::scanf("%zu", &a[i]);
    chmin(dp[a[i]], i);
  }
  usize len = 0;
  bool has_ln = true;
  while (has_ln) {
    ++len;
    has_ln = false;
    std::fill(exc.begin(), exc.end(), n);
    for (const usize p : prime) {
      for (usize i = 1; i * p < ALim; ++i) {
        chmin(dp[i * p], dp[i]);
        chmin(exc[i * p], dp[i]);
      }
    }
    std::fill(dp.begin(), dp.end(), n);
    for (usize i = 0; i != n; ++i) {
      if (exc[a[i]] < i) {
        chmin(dp[a[i]], i);
        has_ln = true;
      }
    }
  }
  std::printf("%zu\n", len);
}