import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		double num=Double.parseDouble(br.readLine());
		br.close();

		int count=1;
		double tmp;

		while(true){
			tmp=Math.sqrt(count*num);
			if(tmp-Math.floor(tmp)>0){
				count++;
				continue;
			}
			break;
		}
		System.out.println(count);
	}
}