import java.io.*;
import java.util.*;


public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    }
    static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    }

}


class InputReader extends BufferedReader {
    StringTokenizer tokenizer;

    public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    }

    public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    }

    public Integer nextInt() {
        return Integer.valueOf(next());
    }
    public Long nextLong() {return  Long.valueOf(next());}

    static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    }
} import java.io.*; io.* java import java.util.*; util.* java public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    }
    static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    }

} Main public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream); out new InputReader.OutputWriter(outputStream) int n = in.nextInt(); n in.nextInt() in.nextInt in int k = in.nextInt(); k in.nextInt() in.nextInt in int [] a = new int[n]; a new int[n] n for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        } int i = 0; int i = 0; i 0 i < a.length i a.length a a.length i++ i++ i {
            a[i] = in.nextInt();
        } {
            a[i] = in.nextInt();
        } a[i] = in.nextInt() a[i] a i in.nextInt() in.nextInt in int [] dp = new int[n+1]; dp new int[n+1] n+1 n 1 for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            dp[i + 1] = dp[i] + a[i];
        } {
            dp[i + 1] = dp[i] + a[i];
        } dp[i + 1] = dp[i] + a[i] dp[i + 1] dp i + 1 i 1 dp[i] + a[i] dp[i] dp i a[i] a i int index = lower_Bound(dp,k); index lower_Bound(dp,k) lower_Bound dp k if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        } index == dp.length || dp[index] != k index == dp.length index dp.length dp dp.length dp[index] != k dp[index] dp index k {
            out.println(index);
        } out.println(index) out.println out index {
            out.println(index + 1);
        } out.println(index + 1) out.println out index + 1 index 1 out.flush() out.flush out String[] args args static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    } lower_Bound {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    } int lo = 0; lo 0 int hi = a.length - 1; hi a.length - 1 a.length a a.length 1 while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        } lo<=hi lo hi {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        } int med = lo+(hi-lo)/2; med lo+(hi-lo)/2 lo (hi-lo)/2 (hi-lo) hi lo 2 if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            } target<=a[med] target a[med] a med {
                hi = med - 1;
            } hi = med - 1 hi med - 1 med 1 {
                lo = med + 1;
            } lo = med + 1 lo med + 1 med 1 return lo; lo int [] a a int target target class InputReader extends BufferedReader {
    StringTokenizer tokenizer;

    public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    }

    public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    }

    public Integer nextInt() {
        return Integer.valueOf(next());
    }
    public Long nextLong() {return  Long.valueOf(next());}

    static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    }
} InputReader StringTokenizer tokenizer; tokenizer public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    } InputReader {
        super(new InputStreamReader(inputStream), 32768);
    } super(new InputStreamReader(inputStream), 32768) super new InputStreamReader(inputStream) 32768 InputStream inputStream inputStream public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    } InputReader {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    } super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename))) super new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)) String filename filename public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    } next {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    } while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        } try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            } catch (IOException e) {
                throw new RuntimeException();
            } IOException e {
                throw new RuntimeException();
            } throw new RuntimeException(); new RuntimeException() {
                tokenizer = new StringTokenizer(readLine());
            } tokenizer = new StringTokenizer(readLine()) tokenizer new StringTokenizer(readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public Integer nextInt() {
        return Integer.valueOf(next());
    } nextInt {
        return Integer.valueOf(next());
    } return Integer.valueOf(next()); Integer.valueOf(next()) Integer.valueOf Integer next() next public Long nextLong() {return  Long.valueOf(next());} nextLong {return  Long.valueOf(next());} return  Long.valueOf(next()); Long.valueOf(next()) Long.valueOf Long next() next static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    } OutputWriter public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        } OutputWriter {
            super(outputStream);
        } super(outputStream) super outputStream OutputStream outputStream outputStream public OutputWriter(Writer writer) {
            super(writer);
        } OutputWriter {
            super(writer);
        } super(writer) super writer Writer writer writer public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        } OutputWriter {
            super(filename);
        } super(filename) super filename String filename filename public void close() {
            super.close();
        } close {
            super.close();
        } super.close() super.close super PrintWriter BufferedReader public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    }
    static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    }

} public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    }
    static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    }

} Main
import java.io.*;
import java.util.*;


public class Main {

    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);


        int n = in.nextInt();
        int k = in.nextInt();
        int [] a = new int[n];
        for (int i = 0; i < a.length; i++) {
            a[i] = in.nextInt();
        }
        int [] dp = new int[n+1];
        for (int i = 0; i < n; i++) {
            dp[i + 1] = dp[i] + a[i];
        }

        int index = lower_Bound(dp,k);
        
        if(index == dp.length || dp[index] != k) {
            out.println(index);
        }
        else {
            out.println(index + 1);
        }
        out.flush();
    }
    static int lower_Bound(int [] a, int target) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo<=hi) {
            int med = lo+(hi-lo)/2;
            if(target<=a[med]) {
                hi = med - 1;
            }
            else {
                lo = med + 1;
            }
        }
        return lo;
    }

}


class InputReader extends BufferedReader {
    StringTokenizer tokenizer;

    public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    }

    public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    }

    public Integer nextInt() {
        return Integer.valueOf(next());
    }
    public Long nextLong() {return  Long.valueOf(next());}

    static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    }
}
