#include <bits/stdc++.h>

#define nmax 5001
#define gmax 10001

using namespace std;

int main()
{
    ifstream fin("a.in");
    ofstream fout("a.out");

    int n, g;
    int w[nmax], p[nmax], dp[gmax];

    fin>>n>>g;
    for(int i=1; i<=n; i++) {
        fin>>w[i]>>p[i];
    }

    int sol = 0;
    for(int i=1; i<=n; i++) {
        for(int j=g; j>=w[i]; j--) {
            dp[j] = max(dp[j-w[i]]+p[i], dp[j]);
            if(dp[j]>sol) {
                sol=dp[j];
            }
        }
    }

    fout<<sol<<endl;

    return 0;
}