60分求助

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;
import java.util.Arrays;
import java.util.Comparator;

class Main{
    static StreamTokenizer st=new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
    public static void main(String[] args) throws IOException {
        int n=nextInt();
        int limStrength=nextInt();
        int bandeng=nextInt();
        int gao=nextInt();
        Ping[] arr=new Ping[n];
        for(int i=0;i<n;i++)
        {
            Ping p=new Ping();
            p.setGao(nextInt());

            if(p.getGao()<bandeng+gao)
            {
                p.setLi(nextInt());
            }
            else
            {
                nextInt();
                p.setLi(Integer.MAX_VALUE);
            }
            arr[i]=p;
        }
        Arrays.sort(arr,new Comparator<Ping>() {

            @Override
            public int compare(Ping o1, Ping o2) {
                // TODO 自动生成的方法存根
                return o1.getLi()-o2.getLi();
            }
        });
        int i=0;
        int count=0;
        while(i<n&&limStrength>=arr[i].getLi())
        {
            limStrength=limStrength-arr[i].getLi();
            count++;
            i++;
        }
        System.out.println(count);
    }
    static int nextInt() {
        try {
            st.nextToken();
        } catch (IOException e) {
        }
        return (int)st.nval;
    }
}
class Ping{
    int gao;
    int li;
    public int getGao() {
        return gao;
    }
    public void setGao(int gao) {
        this.gao = gao;
    }
    public int getLi() {
        return li;
    }
    public void setLi(int li) {
        this.li = li;
    }
}

如上,WA了第二个和第五个,求助