#include <bits/stdc++.h>
#define N 5001
#define X 10001
using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int s, p, n, g, a1[X], a2[X], a[X];

void citire(){
    cin>>n>>g;
    for(int i = 1; i <= n; ++i)
        cin>>a1[i]>>a2[i];

}

void alg(){
    for(int i = 1; i <= n; ++i){
        for(int j=g-a1[i]; j >= 0; j--)
        {
            if(a[j+a1[i]]< a[j]+a2[i])
            {

                a[j+a1[i]]=a[j]+a2[i];
                if(a[j+a1[i]] > s)
                {
                    s=a[j+a1[i]];
                }
            }
        }
    }
}

int main(){
    citire();
    alg();
    cout<<s;
}