BirthdayChocolate.java

//birthdaychocolate
import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

public class BirthdayChocolate {

    static int birthday(List<Integer> s, int d, int m) {

        int count=0,sum;
        
        for(int i=0;i<s.size();i++)
        {
            sum=0;
            for(int j=0;j<m;j++)
            {
                if(i+j<s.size())
                sum+=s.get(i+j);
            }
            if(sum==d)
                ++count;
        }
        return count;
    }

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> s = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        String[] dm = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int d = Integer.parseInt(dm[0]);

        int m = Integer.parseInt(dm[1]);

        int result = birthday(s, d, m);//birthday result

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}