Problem:
Score : 100 points

Problem Statement

There are N items, numbered 1, 2, \ldots, N.
For each i (1 \leq i \leq N), Item i has a weight of w_i and a value of v_i.

Taro has decided to choose some of the N items and carry them home in a knapsack.
The capacity of the knapsack is W, which means that the sum of the weights of items taken must be at most W.

Find the maximum possible sum of the values of items that Taro takes home.

Constraints

All values in input are integers.

1 \leq N \leq 100

1 \leq W \leq 10^9

1 \leq w_i \leq W

1 \leq v_i \leq 10^3

Input

Input is given from Standard Input in the following format:

N W
w_1 v_1
w_2 v_2
:
w_N v_N

Output

Print the maximum possible sum of the values of items that Taro takes home.

Sample Input 1

3 8
3 30
4 50
5 60

Sample Output 1

90

Items 1 and 3 should be taken.
Then, the sum of the weights is 3 + 5 = 8, and the sum of the values is 30 + 60 = 90.

Sample Input 2

1 1000000000
1000000000 10

Sample Output 2

10

Sample Input 3

6 15
6 5
5 6
6 4
6 6
3 5
7 2

Sample Output 3

17

Items 2, 4 and 5 should be taken.
Then, the sum of the weights is 5 + 6 + 3 = 14, and the sum of the values is 6 + 6 + 5 = 17.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.PriorityQueue;
import java.util.Random;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.function.BiFunction;
import java.util.function.IntBinaryOperator;
import java.util.function.LongBinaryOperator;
import java.util.stream.*;
// import static java.util.Arrays.compare;
import static java.util.Arrays.fill;
import static java.util.Arrays.sort;
import static java.util.Collections.sort;
import static java.util.Comparator.reverseOrder;
// import static java.util.List.of;
import static java.util.Objects.isNull;
import static java.util.Objects.nonNull;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;

import java.math.BigInteger;
import static java.math.BigInteger.ZERO;
import static java.math.BigInteger.ONE;
// import static java.math.BigInteger.TWO;
import static java.math.BigInteger.TEN;

import static java.lang.Math.PI;
import static java.lang.Math.E;
import static java.lang.Math.min;
import static java.lang.Math.max;
import static java.lang.Math.abs;
import static java.lang.Math.sin;
import static java.lang.Math.cos;
import static java.lang.Math.tan;
import static java.lang.Math.asin;
import static java.lang.Math.acos;
import static java.lang.Math.atan;
import static java.lang.Math.atan2;
import static java.lang.Math.hypot;
import static java.lang.Math.sqrt;
import static java.lang.Math.log;
import static java.lang.Math.exp;
import static java.lang.String.format;
import static java.lang.System.exit;
import static java.lang.System.currentTimeMillis;

public class Main {
    public static long MOD = 1_000_000_007;

    public static void main(String[] args) {
        FastScanner fsc=new FastScanner();
        int N=fsc.nextInt();
        long W=fsc.nextLong();
        long[] w=new long[N];
        int[] v=new int[N];
        for(int i=0;i<N;i++){
            w[i]=fsc.nextLong();
            v[i]=fsc.nextInt();
        }
        fsc.close();
        long[][] dp=new long[N][100001];
        for(int i=0;i<N;i++){
            fill(dp[i], W+1);
        }
        dp[0][0]=0;
        dp[0][v[0]]=w[0];
        for(int i=0;i<N-1;i++){
            for(int j=0;j<=100000;j++){
                dp[i+1][j]=min(dp[i+1][j], dp[i][j]);
                dp[i+1][j+v[i+1]]=min(dp[i+1][j+v[i+1]], dp[i][j]+w[i+1]);
            }
        }
        for(int j=100000;j>=0;j--){
            if(dp[N-1][j]<=W){
                System.out.println(j);
                return;
            }
        }
    }

    static class IntUtil {
        public static int min(int a, int... b) {
            int ret = a;
            for (int c : b) {
                ret = Math.min(ret, c);
            }
            return ret;
        }

        public static int max(int a, int... b) {
            int ret = a;
            for (int c : b) {
                ret = Math.max(ret, c);
            }
            return ret;
        }

        /**
         * Caluculate the ceil of a/b. Returns the smallest integer greater than or
         * equal to a/b while 'a/b' rounds fractional parts to ZERO.
         * 
         * @param a
         * @param b
         * @return the smallest integer greater than or equal to a/b
         */
        public static int ceilDiv(int a, int b) {
            if ((a > 0 && b > 0) || (a < 0 && b < 0)) {
                if (b > 0) {
                    return (a + b - 1) / b;
                } else {
                    return (a + b + 1) / b;
                }
            } else {
                return a / b;
            }
        }

        /**
         * Caluculate the floor of a/b. Returns the largest integer less than or equal
         * to a/b while 'a/b' rounds fractional parts to ZERO.
         * 
         * @param a
         * @param b
         * @return the largest integer less than or equal to a/b
         */
        public static int floorDiv(int a, int b) {
            if ((a > 0 && b > 0) || (a < 0 && b < 0)) {
                return a / b;
            } else {
                if (b > 0) {
                    return (a - b + 1) / b;
                } else {
                    return (a - b - 1) / b;
                }
            }
        }

        public static int fold(IntBinaryOperator func, int a, int... b) {
            int ret = a;
            for (int c : b) {
                ret = func.applyAsInt(ret, c);
            }
            return ret;
        }
    }

    static class LongUtil {
        public static long min(long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret = Math.min(ret, c);
            }
            return ret;
        }

        public static long max(long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret = Math.max(ret, c);
            }
            return ret;
        }

        /**
         * Caluculate the ceil of a/b. Returns the smallest integer greater than or
         * equal to a/b while 'a/b' rounds fractional parts to ZERO.
         * 
         * @param a
         * @param b
         * @return the smallest integer greater than or equal to a/b
         */
        public static long ceilDiv(long a, long b) {
            if ((a > 0 && b > 0) || (a < 0 && b < 0)) {
                if (b > 0) {
                    return (a + b - 1) / b;
                } else {
                    return (a + b + 1) / b;
                }
            } else {
                return a / b;
            }
        }

        /**
         * Caluculate the floor of a/b. Returns the largest integer less than or equal
         * to a/b while 'a/b' rounds fractional parts to ZERO.
         * 
         * @param a
         * @param b
         * @return the largest integer less than or equal to a/b
         */
        public static long floorDiv(long a, long b) {
            if ((a > 0 && b > 0) || (a < 0 && b < 0)) {
                return a / b;
            } else {
                if (b > 0) {
                    return (a - b + 1) / b;
                } else {
                    return (a - b - 1) / b;
                }
            }
        }

        public static long fold(LongBinaryOperator func, long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret = func.applyAsLong(ret, c);
            }
            return ret;
        }
    }

    static class MathUtil{
        /**
         * Enumarate primes less than n.
         * 
         * @param n
         * @return {@code ArrayList} that holds primes.
         */
        public static ArrayList<Integer> eratosthenes(int n) {
            int[] div = eratosthenesDivisors(n);
            ArrayList<Integer> result = new ArrayList<>();
            for (int i = 2; i <= n; i++) {
                if (div[i] == i) {
                    result.add(i);
                }
            }
            return result;
        }
        /**
         * execute eratosthenes's prime-enumerate algorithm. a[i] holds the greatest
         * divisor of i. if a[i]=i, i is a prime number. This arrary enables you to
         * prime-factorize in O(log n) time. (<O(sqrt n)).
         * 
         * @param n
         * @return divisor array.
         */
        public static int[] eratosthenesDivisors(int n) {
            int[] divisors = new int[n + 1];
            if (n <= 0) {
                return null;
            }
            for (int i = 1; i <= n; i++) {
                if ((i & 1) != 0) {
                    divisors[i] = i;
                } else {
                    divisors[i] = 2;
                }
            }
            for (long i = 3; i <= n; i += 2) {
                if (divisors[(int) i] == (int) i) {
                    for (long j = i * i; j <= n; j += (i << 1)) {
                        divisors[(int) j] = (int) i;
                    }
                }
            }
            return divisors;
        }

        /**
         * Caluculate prime-factorization.
         * 
         * @param n
         * @return {@code HashMap} of {prime: index}
         */
        public static HashMap<Long, Integer> primeFactorization(long n) {
            HashMap<Long, Integer> primes = new HashMap<Long, Integer>();
            for (long p = 2; p * p <= n; p++) {
                int q = 0;
                while (n % p == 0) {
                    n /= p;
                    q++;
                }
                if (q > 0) {
                    primes.put(p, q);
                }
            }
            if (n > 1) {
                primes.put(n, 1);
            }
            return primes;
        }

        private static HashMap<Long, Integer> lcm(HashMap<Long, Integer> amap, HashMap<Long, Integer> bmap) {
            if (amap.size() < bmap.size()) {
                return lcm(bmap, amap);
            }
            HashMap<Long, Integer> lcm = amap;
            for (Map.Entry<Long, Integer> e : bmap.entrySet()) {
                long prime = e.getKey();
                if (lcm.containsKey(prime)) {
                    lcm.put(prime, Math.max(lcm.get(prime), e.getValue()));
                } else {
                    lcm.put(prime, e.getValue());
                }
            }
            return lcm;
        }

        private static HashMap<Long, Integer> lcm(HashMap<Long, Integer> amap, long b) {
            HashMap<Long, Integer> bmap = primeFactorization(b);
            return lcm(amap, bmap);
        }

        public static HashMap<Long, Integer> lcm(long a, long... b) {
            HashMap<Long, Integer> amap = primeFactorization(a);
            for (long c : b) {
                amap = lcm(amap, c);
            }
            return amap;
        }
        public static long unsafeLCM(long a, long b) {
            return a * b / gcd(a, b);
        }

        /**
         * Caluculate the GCD of (a, b)/
         * 
         * @param a first value
         * @param b second value
         * @return GCD(a, b)
         */
        public static long gcd(long a, long b) {
            if (a < b) {
                return gcd(b, a);
            }
            long r = a % b;
            while (r != 0) {
                a = b;
                b = r;
                r = a % b;
            }
            return b;
        }

        /**
         * Return one of the solutions to {@code ax+by=gcd(a, b)}.
         * 
         * @return {@code x}, {@code y}, {@code gcd(a, b)}.
         * @param a a of ax+by=gcd(a, b).
         * @param b b of ax+by=gcd(a, b). class ReferenceLong is a reference type of long.
         */
        public static long[] extGCD(long a, long b) {
            ReferenceLong x = new ReferenceLong();
            ReferenceLong y = new ReferenceLong();
            long[] ret = new long[3];
            ret[2] = extGCD(a, b, x, y);
            ret[0] = x.v;
            ret[1] = y.v;
            return ret;
        }

        private static long extGCD(long a, long b, ReferenceLong x, ReferenceLong y) {
            if (b == 0) {
                x.v = 1;
                y.v = 0;
                return a;
            }
            long d = extGCD(b, a % b, y, x);
            y.v -= a / b * x.v;
            return d;
        }

        private static class ReferenceLong {
            long v = 0;
        }
    }

   

    static class IntArrayUtil{
        public static void reverse(int[] a, int begin, int end){
            for(int i=begin;i<begin+(end-begin)/2;i++){
                swap(a, i, begin+end-i-1);
            }
        }
        public static void reverse(int[] a){
            reverse(a, 0, a.length);
        }
        public static void revSort(int[] a){
            Arrays.sort(a);
            reverse(a);
        }
        public static int[] nextPermutation(int[] a){
            int[] ret=a.clone();
            int n=ret.length;
            for(int i=n-1;i>=1;i--){
                if(ret[i]>ret[i-1]){
                    int fail=n, pass=i;
                    while(fail-pass>1){
                        int mid=pass+(fail-pass)/2;
                        if(ret[mid]>ret[i-1]) pass=mid;
                        else fail=mid;
                    }
                    swap(ret, pass, i-1);
                    reverse(ret, i, n);
                    return ret;
                }
            }
            return null;
        }
        public static int[] predPermutation(int[] a){
            int[] ret=a.clone();
            int n=ret.length;
            for(int i=n-1;i>=1;i--){
                if(ret[i]<ret[i-1]){
                    int fail=n, pass=i;
                    while(fail-pass>1){
                        int mid=pass+(fail-pass)/2;
                        if(ret[mid]<ret[i-1]) pass=mid;
                        else fail=mid;
                    }
                    swap(ret, pass, i-1);
                    reverse(ret, i, n);
                    return ret;
                }
            }
            return null;
        }
        public static void swap(int[] a, int u, int v){
            int tmp=a[u];
            a[u]=a[v];
            a[v]=tmp;
        }
        public static int compare(int[] a, int[] b){
            for(int i=0;i<a.length;i++){
                if(i>=b.length){
                    return -1;
                } else if(a[i]>b[i]){
                    return 1;
                } else if(a[i]<b[i]){
                    return -1;
                }
            }
            if(a.length<b.length){
                return 1;
            } else{
                return 0;
            }
        }
        public static boolean equals(int[] a, int[] b){
            return compare(a, b)==0;
        }
    }
    
    static class LongArrayUtil{
        public static void reverse(long[] a, int begin, int end){
            for(int i=begin;i<begin+(end-begin)/2;i++){
                long tmp=a[i];
                a[i]=a[begin+end-i-1];
                a[begin+end-i-1]=tmp;
            }
        }
        public static void reverse(long[] a){
            reverse(a, 0, a.length);
        }
        public static void revSort(long[] a){
            Arrays.sort(a);
            reverse(a);
        }
        public static long[] nextPermutation(long[] a){
            long[] ret=a.clone();
            int n=ret.length;
            for(int i=n-1;i>=1;i--){
                if(ret[i]>ret[i-1]){
                    int fail=n, pass=i;
                    while(fail-pass>1){
                        int mid=pass+(fail-pass)/2;
                        if(ret[mid]>ret[i-1]) pass=mid;
                        else fail=mid;
                    }
                    swap(ret, pass, i-1);
                    reverse(ret, i, n);
                    return ret;
                }
            }
            return null;
        }
        public static long[] predPermutation(long[] a){
            long[] ret=a.clone();
            int n=ret.length;
            for(int i=n-1;i>=1;i--){
                if(ret[i]<ret[i-1]){
                    int fail=n, pass=i;
                    while(fail-pass>1){
                        int mid=pass+(fail-pass)/2;
                        if(ret[mid]<ret[i-1]) pass=mid;
                        else fail=mid;
                    }
                    swap(ret, pass, i-1);
                    reverse(ret, i, n);
                    return ret;
                }
            }
            return null;
        }
        public static void swap(long[] a, int u, int v){
            long tmp=a[u];
            a[u]=a[v];
            a[v]=tmp;
        }
        public static int compare(long[] a, long[] b){
            for(int i=0;i<a.length;i++){
                if(i>=b.length){
                    return -1;
                } else if(a[i]>b[i]){
                    return 1;
                } else if(a[i]<b[i]){
                    return -1;
                }
            }
            if(a.length<b.length){
                return 1;
            } else{
                return 0;
            }
        }
        public static boolean equals(long[] a, long[] b){
            return compare(a, b)==0;
        }
    }

    static class ModUtil{
        private static long safeMAX = 100_000_000_000_000_000l;
        public static long modFold(LongBinaryOperator function, long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret = function.applyAsLong(ret, c);
                ret %= MOD;
            }
            return ret;
        }

        public static long modAdd(long a, long... b) {
            long ret = a;
            for (long c : b) {
                if (ret >= safeMAX || ret <= -safeMAX) {
                    ret %= MOD;
                }
                ret += c;
            }
            return ret;
        }

        public static long modMul(long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret *= c;
                ret %= MOD;
            }
            return ret;
        }

        public static long modDiv(long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret *= modinv(c);
                ret %= MOD;
            }
            return ret;
        }

        public static long modSub(long a, long... b) {
            long ret = a;
            for (long c : b) {
                ret -= c;
                if (ret >= safeMAX || ret <= -safeMAX) {
                    ret %= MOD;
                }
            }
            ret %= MOD;
            if (ret < 0) {
                ret += MOD;
            }
            return ret;
        }

        /**
         * Caluculate the value b s.t. a*b mod MOD = 1.
         * 
         * @param a
         * @return inverse of a
         */
        public static long modinv(long a) {
            long b = MOD;
            long u = 1, v = 0;
            while (b >= 1) {
                long t = a / b;
                a -= t * b;
                long tmp1 = a;
                a = b;
                b = tmp1;
                u -= t * v;
                long tmp2 = u;
                u = v;
                v = tmp2;
            }
            u %= MOD;
            return u >= 0 ? u : u + MOD;
        }

        /**
         * Caluculate the combination nCr.
         * 
         * @param n left
         * @param r right
         * @return nCr
         */
        public static long comb(long n, long r) {
            if (n < r) {
                return 0;
            }
            r = Math.min(r, n - r);
            long res = 1;
            for (long d = 1; d <= r; d++) {
                res *= n;
                res %= MOD;
                n--;
                res *= modinv(d);
                res %= MOD;
            }
            return res;
        }
    }

    static class FastScanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;

        private boolean hasNextByte() {
            if (ptr < buflen) {
                return true;
            } else {
                ptr = 0;
                try {
                    buflen = in.read(buffer);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (buflen <= 0) {
                    return false;
                }
            }
            return true;
        }

        private int readByte() {
            if (hasNextByte())
                return buffer[ptr++];
            else
                return -1;
        }

        private static boolean isPrintableChar(int c) {
            return 33 <= c && c <= 126;
        }

        public boolean hasNext() {
            while (hasNextByte() && !isPrintableChar(buffer[ptr]))
                ptr++;
            return hasNextByte();
        }

        public String next() {
            if (!hasNext())
                throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while (isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }

        public long nextLong() {
            if (!hasNext())
                throw new NoSuchElementException();
            long n = 0;
            boolean minus = false;
            int b = readByte();
            if (b == '-') {
                minus = true;
                b = readByte();
            }
            if (b < '0' || '9' < b) {
                throw new NumberFormatException();
            }
            while (true) {
                if ('0' <= b && b <= '9') {
                    n *= 10;
                    n += b - '0';
                } else if (b == -1 || !isPrintableChar(b)) {
                    return minus ? -n : n;
                } else {
                    throw new NumberFormatException();
                }
                b = readByte();
            }
        }

        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
                throw new NumberFormatException();
            return (int) nl;
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }

        public void close(){
            try{
                in.close();
            } catch(Exception e){
                e.printStackTrace();
            }
        }
    }
}