#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for (int i = 0; i < (int)n; ++i)
#define FOR(i, a, b) for (int i = a; i < (int)b; ++i)
#define rrep(i, n) for (int i = ((int)n - 1); i >= 0; --i)

using ll = long long;
using ld = long double;

__attribute__((unused)) const ll INF = 1e18;
__attribute__((unused)) const int Inf = 1e9;
__attribute__((unused)) const double EPS = 1e-9;
__attribute__((unused)) const ll MOD = 1000000007;

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(0);
  int n;
  cin >> n;
  vector<int> dp(1e7, Inf);
  dp[1] = 0;
  FOR(i, 1, n + 1) {
    FOR(j, 1, n + 1) {
      if (i * j > n) break;
      dp[i * j] = min(dp[i * j], dp[i] + j);
    }
  }
  cout << dp[n] << endl;
}