#include <bits/stdc++.h>
#define nmax 5005
using namespace std;
string prob="rucsac";
ifstream in(prob+".in");
ofstream out(prob+".out");
int d[2*nmax],w[nmax],p[nmax];
int main(){
    int n,g;
    in>>n>>g;
    for(int i=1;i<=n;i++){
        in>>w[i]>>p[i];
        for(int j=g;j>=w[i];j--){
            d[j]=max(d[j],d[j-w[i]]+p[i]);
        }
    }
    out<<d[g];
}