#include<iostream>
 #include<cassert>
 #include<cmath>
 #include<string>
 #include<cstdio>
 #include<iomanip>
 #include<stdio.h>      /* printf, scanf, puts, NULL */
 #include<stdlib.h>     /* srand, rand */
 #include<time.h>
 #include<fstream>
  using namespace std;

  int main()
   {
    int n;
    cin >> n;
    int m = 0; 
    for(int t = 0; t < n; t++)
     for(int i = 0; i < sqrt(t) and m < n; i++)
      m++;
    return 1;
   }