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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define endl "\n"
  4. #define F first
  5. #define S second
  6. #define loop(a,n) for(int i=a; i<=n ; i++)
  7. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  8. #define NAME ""
  9. using namespace std;
  10.  
  11. int main(){
  12.     ios_base::sync_with_stdio(0);
  13.     cin.tie(0);cout.tie(0);
  14.     //freopen(NAME".INP","r",stdin);
  15.     //freopen(NAME".OUT","w",stdout);
  16.     int n,a,b,c;
  17.     cin>>n;
  18.     if(n<5) cout<<2;
  19.     else {
  20.         a=2,b=3,c=a;
  21.         while(a<=n) {
  22.             c=a;
  23.             a+=b;
  24.             b*=3;
  25.  
  26.         }
  27.         cout<<c;
  28.     }
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5324KB
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stdin 
Standard input is empty
stdout 
29525
https://ideone.com/iHDIhp
language:
C++ (gcc 8.3)
created:
18 hours ago
visibility:
public

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