#include <iostream>
using namespace std;
/*
Declaram si citim variabila “n”.
Declaram variabila “squareRoot” pe care o initializam cu “0”.
Declaram variabila “i” pe care o initializam cu “1”.
 
Declarăm o structura repetitiva while a carei condiții de rulare verifica ca
“i” înmulțit cu el însuși sa fie mai mic sau egal ca “n”:
	a. “i” se incrementeaza la fiecare pas.
	b. Incrementam variabila “squareRoot”.
 
Afisam valoarea variabilei “squareRoot”.
*/
 
int main() {
	int n, i = 1;
	cin >> n;
	while (i * i <= n) {
		++i;
	}
	cout << i - 1;
	return 0;
}

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