From 75c90641c3930b9a0f34d22b24ba996087dcfa77 Mon Sep 17 00:00:00 2001
From: oncsr <khj20006@naver.com>
Date: Fri, 3 Oct 2025 23:22:55 +0900
Subject: [PATCH] =?UTF-8?q?[20251003]=20BOJ=20/=20G2=20/=20=EC=8B=9C?=
 =?UTF-8?q?=EA=B7=B8=EB=A7=88=20=ED=95=A8=EC=88=98=20/=20=EA=B6=8C?=
 =?UTF-8?q?=ED=98=81=EC=A4=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...0\353\247\210 \355\225\250\354\210\230.md" | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 "khj20006/202510/03 BOJ G2 \354\213\234\352\267\270\353\247\210 \355\225\250\354\210\230.md"

diff --git "a/khj20006/202510/03 BOJ G2 \354\213\234\352\267\270\353\247\210 \355\225\250\354\210\230.md" "b/khj20006/202510/03 BOJ G2 \354\213\234\352\267\270\353\247\210 \355\225\250\354\210\230.md"
new file mode 100644
index 00000000..13da57ae
--- /dev/null
+++ "b/khj20006/202510/03 BOJ G2 \354\213\234\352\267\270\353\247\210 \355\225\250\354\210\230.md"	
@@ -0,0 +1,34 @@
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+ll N;
+
+unordered_set<ll> m;
+bitset<1000001> e;
+vector<ll> p = {2};
+
+void bck(ll n) {
+    for(ll i:p) {
+        if((__int128)n*i > (__int128)N) break;
+        if(m.count(n*i)) continue;
+        m.insert(n*i);
+        bck(n*i);
+    }
+}
+
+int main(){
+    cin.tie(0)->sync_with_stdio(0);
+    
+    for(int i=2;i*i<=1000000;i++) if(!e[i]) for(int j=i*i;j<=1000000;j+=i) e[j] = 1;
+    for(ll i=3;i<=1000000;i++) if(!e[i]) p.push_back(i*i);
+
+    cin>>N;
+    m.insert(1);
+    bck(1);
+    
+    cout<<N-m.size()<<'\n';
+
+}
+```