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#include<iostream> |
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#include<cstdio> |
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#include<algorithm> |
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#include<climits> |
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#include<cstring> |
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#include<string> |
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#include<sstream> |
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#include<cmath> |
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#include<vector> |
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#include<queue> |
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#include<cstdlib> |
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#include<deque> |
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#include<stack> |
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#include<map> |
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#include<set> |
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#define __FastIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0) |
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#define __FileRead freopen ("/home/saikat/Desktop/logN/input.txt", "r", stdin); |
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#define __FileWrite freopen ("/home/saikat/Desktop/logN/output.txt", "w", stdout); |
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#define SET(a,v) memset(a,v,sizeof(a)) |
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#define pii pair<int,int> |
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#define pll pair <ll, ll> |
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#define debug cout <<"#########\n"; |
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#define nl cout << "\n"; |
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#define sp cout << " "; |
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#define sl(n) scanf("%lld", &n) |
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#define sf(n) scanf("%lf", &n) |
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#define si(n) scanf("%d", &n) |
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#define ss(n) scanf("%s", n) |
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#define pf(n) scanf("%d", n) |
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#define pfl(n) scanf("%lld", n) |
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#define all(v) v.begin(), v.end() |
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#define Pow2(x) ((x)*(x)) |
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#define Mod(x, m) ((((x) % (m)) + (m)) % (m)) |
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#define Max3(a, b, c) max(a, max(b, c)) |
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#define Min3(a, b, c) min(a, min(b, c)) |
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#define pb push_back |
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#define mk make_pair |
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#define MAX 100005 |
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#define INF 1000000000 |
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#define MOD 1000000007 |
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using namespace std; |
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typedef long long ll; |
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typedef unsigned long long ull; |
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template <typename T> |
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std::string NumberToString ( T Number ) { |
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std::ostringstream ss; |
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ss << Number; |
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return ss.str(); |
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} |
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ll lcm (ll a, ll b) { |
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return a * b / __gcd (a, b); |
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} |
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int check (ll n) { |
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ll sq = sqrt (n); |
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if (sq * sq == n) return 1; |
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else return 0; |
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} |
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int main () { |
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ll N; |
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while (scanf ("%lld", &N) == 1) { |
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ll sq = sqrt (N), ans = 0; |
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for (int i = 1; i <= sq; i++) { |
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int cnt = 0; |
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for (int j = i; j <= N; j++) { |
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if (i * j <= N) cnt++; |
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} |
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ans += cnt; |
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} |
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printf ("%lld\n", ans); |
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} |
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return 0; |
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} |
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