// Slower C++ solution:
#include <bits/stdc++.h>

using namespace std;





//************** StrAnge.R *********************



#define ll              long long int

#define ull             unsigned long long

#define ld              long double

#define lll             __int128

#define vi              vector<int>

#define vl              vector<ll>

#define vvi             vector<vector<int> >

#define pii             pair<int,int>

#define piii            pair<int,pair<int,int> >

#define pll             pair<ll,ll>

#define vii             vector<pii>

#define min_pq      priority_queue<int,vector<int>,greater<int> >



#define sz(v)           ((int)(v).size())

#define all(s)          s.begin(),s.end()

#define allr(s)         s.rbegin(),s.rend()

#define unq(c)          (sort(all(c)), c.resize(distance(c.begin(),unique(all(c)))))

#define get_pos(c,x)    (lower_bound(all(c),x)-c.begin())

#define ran(a, b)       ((((rand() << 15) ^ rand()) % ((b) - (a) + 1)) + (a))



#define MS0(v)          memset((v), 0, sizeof((v)))

#define MS1(v)          memset((v), -1, sizeof((v)))

#define LEN(v)          strlen(v)



#define MP              make_pair

#define pb              push_back

#define pob             pop_back

#define ff              first

#define ss              second

#define sc              scanf

#define pf              printf

#define endl            "\n"



#define LL              ({ll __LL; scanf("%lld",&__LL); __LL;})

#define II              ({int __II; scanf("%d",&__II); __II;})

#define CC              ({char __CC; scanf("%c",&__CC); __CC;})

#define DD              ({double __DD; scanf("%lf",&__DD); __DD;})



#define intmx           INT_MAX

#define llmx            1llu<<61

#define PI              3.14159265358979323846264338327950L

#define MOD             1000000007

#define MAX             100010



#define gcd(a, b)       __gcd(a, b)

#define lcm(a, b)       ((a)*((b)/gcd(a,b)))



#define shuffle(v)          (random_shuffle(all(v)))

#define min_ele(v)          (*min_element(all(v)))

#define max_ele(v)          (*max_element(all(v)))

#define is_equal(x, y)      (abs(x-y)<eps)

#define cnt_ele(v, x)       (count(all(v), x))

#define sum_ele(v)          (accumulate(all(v),0))

#define pro_ele(v)          (accumulate(all(v),1, multiplies<int>()))

#define init_range(v, x)    (iota(all(v),x))



#define TEST_CASE       int ___T; scanf("%d",&___T); for(int cs=1;cs<=___T;cs++)

#define PRINT_CASE      printf("Case %d: ", cs)

#define PRINT_CASEN      printf("Case %d: \n", cs)



#define vpf(v, len)     for(int ix=0;ix<len;ix++){pf("%d",v[ix]);if(ix!=len-1)pf(" ");else pf("\n");}

#define vsc(v, len)     for(int ix=0;ix<len;ix++)scanf("%d",&v[ix]);



#define FOR(i, a, b, stp)   for(int i = (a); i <= (b); i+=stp)

#define ROF(i, a, b, stp)   for(int i = (a); i >= (b); i-=stp)



template<class T>inline bool read(T &x) {int c=getchar();int sgn=1;while(~c&&c<'0'||c>'9'){if(c=='-')sgn=-1;c=getchar();}for(x=0;~c&&'0'<=c&&c<='9';c=getchar())x=x*10+c-'0'; x*=sgn; return ~c;}

inline ll exp(ll a, ll p)               { if(p == 0) return 1; ll x = exp(a, p / 2) % MOD; x = (x * x) % MOD; if(p & 1) x = (x * (a % MOD)) % MOD; return x; }



inline int add(int a, int b) { a += b; if(a >= MOD) a -= MOD; return a; }

inline int sub(int a, int b) { a -= b; if(a < MOD) a += MOD; return a; }

inline int multi(ll a, ll b) { a *= b; if(a >= MOD) a %= MOD; return a; }



inline int on_bit(int N,int pos)    {return N = N | (1<<pos);}

inline int off_bit(int N,int pos)   {return N = N & ~(1<<pos);}

inline bool check_bit(ll N,int pos) {return (bool)(N & (1<<pos));}

#define on_bit_cnt(x)               (__builtin_popcount(x))



#define start_clock     clock_t tStart = clock()

#define end_clock       printf("\n>>Runtime: %.10fs\n", (double) (clock() - tStart) / CLOCKS_PER_SEC)



#define fastio          ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)

#define fileio          freopen("in.txt","r",stdin);freopen("out.txt","w",stdout)





//******************* my code starts here **********************************



const ll INF = 1e9 + 5;

int weight[105], value[105], n, w;

vl dp(100005);





ll solve(int pos) {

    if(pos == n) return 0;



    ll ret = 0;

    for(int x = w - weight[pos]; x >= 0; --x) {

        dp[x+weight[pos]] = max(dp[x+weight[pos]], dp[x]+value[pos]);

        ret = max(ret, dp[x+weight[pos]]);

    }

    ret = max(ret, solve(pos+1));



    return ret;

}



int main() {



    n = II; w = II;

    for(int i = 0; i < n; ++i) {

        weight[i] = II; value[i] = II;

    }



    printf("%lld\n", solve(0));



    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.8023138441556261x):
#include <bits/stdc++.h>

using namespace std;





//************** StrAnge.R *********************



#define ll              long long int

#define ull             unsigned long long

#define ld              long double

#define lll             __int128

#define vi              vector<int>

#define vl              vector<ll>

#define vvi             vector<vector<int> >

#define pii             pair<int,int>

#define piii            pair<int,pair<int,int> >

#define pll             pair<ll,ll>

#define vii             vector<pii>

#define min_pq      priority_queue<int,vector<int>,greater<int> >



#define sz(v)           ((int)(v).size())

#define all(s)          s.begin(),s.end()

#define allr(s)         s.rbegin(),s.rend()

#define unq(c)          (sort(all(c)), c.resize(distance(c.begin(),unique(all(c)))))

#define get_pos(c,x)    (lower_bound(all(c),x)-c.begin())

#define ran(a, b)       ((((rand() << 15) ^ rand()) % ((b) - (a) + 1)) + (a))



#define MS0(v)          memset((v), 0, sizeof((v)))

#define MS1(v)          memset((v), -1, sizeof((v)))

#define LEN(v)          strlen(v)



#define MP              make_pair

#define pb              push_back

#define pob             pop_back

#define ff              first

#define ss              second

#define sc              scanf

#define pf              printf

#define endl            "\n"



#define LL              ({ll __LL; scanf("%lld",&__LL); __LL;})

#define II              ({int __II; scanf("%d",&__II); __II;})

#define CC              ({char __CC; scanf("%c",&__CC); __CC;})

#define DD              ({double __DD; scanf("%lf",&__DD); __DD;})



#define intmx           INT_MAX

#define llmx            1llu<<61

#define PI              3.14159265358979323846264338327950L

#define MOD             1000000007

#define MAX             100010



#define gcd(a, b)       __gcd(a, b)

#define lcm(a, b)       ((a)*((b)/gcd(a,b)))



#define shuffle(v)          (random_shuffle(all(v)))

#define min_ele(v)          (*min_element(all(v)))

#define max_ele(v)          (*max_element(all(v)))

#define is_equal(x, y)      (abs(x-y)<eps)

#define cnt_ele(v, x)       (count(all(v), x))

#define sum_ele(v)          (accumulate(all(v),0))

#define pro_ele(v)          (accumulate(all(v),1, multiplies<int>()))

#define init_range(v, x)    (iota(all(v),x))



#define TEST_CASE       int ___T; scanf("%d",&___T); for(int cs=1;cs<=___T;cs++)

#define PRINT_CASE      printf("Case %d: ", cs)

#define PRINT_CASEN      printf("Case %d: \n", cs)



#define vpf(v, len)     for(int ix=0;ix<len;ix++){pf("%d",v[ix]);if(ix!=len-1)pf(" ");else pf("\n");}

#define vsc(v, len)     for(int ix=0;ix<len;ix++)scanf("%d",&v[ix]);



#define FOR(i, a, b, stp)   for(int i = (a); i <= (b); i+=stp)

#define ROF(i, a, b, stp)   for(int i = (a); i >= (b); i-=stp)



template<class T>inline bool read(T &x) {int c=getchar();int sgn=1;while(~c&&c<'0'||c>'9'){if(c=='-')sgn=-1;c=getchar();}for(x=0;~c&&'0'<=c&&c<='9';c=getchar())x=x*10+c-'0'; x*=sgn; return ~c;}

inline ll exp(ll a, ll p)               { if(p == 0) return 1; ll x = exp(a, p / 2) % MOD; x = (x * x) % MOD; if(p & 1) x = (x * (a % MOD)) % MOD; return x; }



inline int add(int a, int b) { a += b; if(a >= MOD) a -= MOD; return a; }

inline int sub(int a, int b) { a -= b; if(a < MOD) a += MOD; return a; }

inline int multi(ll a, ll b) { a *= b; if(a >= MOD) a %= MOD; return a; }



inline int on_bit(int N,int pos)    {return N = N | (1<<pos);}

inline int off_bit(int N,int pos)   {return N = N & ~(1<<pos);}

inline bool check_bit(ll N,int pos) {return (bool)(N & (1<<pos));}

#define on_bit_cnt(x)               (__builtin_popcount(x))



#define start_clock     clock_t tStart = clock()

#define end_clock       printf("\n>>Runtime: %.10fs\n", (double) (clock() - tStart) / CLOCKS_PER_SEC)



#define fastio          ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)

#define fileio          freopen("in.txt","r",stdin);freopen("out.txt","w",stdout)





//******************* my code starts here **********************************



int main() {





    int n = II, w = II;

    vl dp(w+1, 0);



    for(int item = 0; item < n; ++item) {

        int weight = II, value = II;



        for(int x = w - weight; x >= 0; --x) {

            dp[x+weight] = max(dp[x+weight], dp[x]+value);

        }

    }

    printf("%lld\n", max_ele(dp));



    return 0;

}