Submission

Score: 100

User: Phupa

Problemset: มุมขวาบน

Language: cpp

Time: 0.004 second

Submitted On: 2025-10-07 21:47:20

#include <iostream>
using namespace std;
int main()
{
    int input;
    cin>>input;
    int sum=1,sum2=1,plu=6;
    while (1)
    {
        if(sum>input)
        {
        cout<<sum2;
        return 0;
        }
        sum2=sum;
        sum+=plu;
        plu+=8;
    }
    return 0;
}