Answer 1 Looping CPP

#include <bits/stdc++.h>
using namespace std;
#define FIO                           \
    ios_base::sync_with_stdio(false); \
    cin.tie(NULL);                    \
    cout.tie(NULL);

int main()
{
    FIO;
    int n;
    cin >> n;
    int output = 0;
    while (output * output <= n)
     {
        output += 1;
     }
    output -= 1;
    cout << output << endl;
}