import java.lang.reflect.Array;
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = Integer.parseInt(sc.next());
        long count = 0;
        for (long y = 1; y <= n; y++){
            long xx = (n + y) * (n - y);
            if (issquared(xx)){
                count++;
            }
        }
        System.out.print(count);
    }

    private static boolean issquared(long num){
        for (int i = 1; i * i <= num; i++){
            if (i * i == num) return true;
        }
        return false;
    }
}