Опсег Problem 4 (0 / 0)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Range {
   static long zbirCifri(long x){
    long zbir=0;
        while(x>0){
        zbir+=x%10;
            x/=10;
        }
        return zbir;

    }
    static int proveri(long N, long A, long B) {
        // Vasiot kod tuka
       long x;
        for(x=A;x<=B;x++){
        if(x*x + zbirCifri(x) + 200*x == N){
            int rez = (int)x;
            return rez;}

        }
        return -1;
    }

    public static void main(String[] args) throws Exception {
        int i,j,k;

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        long N = Long.parseLong(br.readLine());

        StringTokenizer st = new StringTokenizer(br.readLine());
        long A = Long.parseLong(st.nextToken());
        long B = Long.parseLong(st.nextToken());

       long res = proveri(N, A, B);
        System.out.println(res);

        br.close();

    }

}