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