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import java.util.Scanner;
public class P1035 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int k = scanner.nextInt();
LevelAdd u = new LevelAdd();
u.t(1, k);
}
}
public class LevelAdd {
public int f(int n) {
if (n == 0) {
return 0;
}
return f(n - 1) + 1 / n;
}
public void t(int n, int k) {
if (f(n) > k) {
System.out.println(n);
} else {
t(++n, k);
}
}
}
