#include <fstream>
#include <iostream>
using namespace std;

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

const int N=5005, G=10005;
int n, g, w[N], v[N], dp[G];

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

    for(int i=1;i<=n;++i)
        for(int j=g;j>=w[i];--j)
            dp[j]=max(dp[j], dp[j-w[i]]+v[i]);
    fout<<dp[g];

    return 0;
}