/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.08.13 17:07:33
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;cin >> n;
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        if (i > 1) {
            if (n/i != n/(i+1)) {
                ans++;
            }
        }
        else {
            ans++;
        }
    }
    cout << ans << endl;
    return 0;
}