import java.util.*;

class Solution {

public int solution(int[] citations) {

int answer = 0;

Arrays.sort(citations);

System.out.println(Arrays.toString(citations));

for(int i= 0;i<citations.length;i++){

int remainLen = citations.length - i;

System.out.println(citations[i]+"ll"+ remainLen);

if(citations[i] >= remainLen){

answer = remainLen;

break;

}

}

return answer;

}

}