#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
const int nmax=5000, gmax=10000;
int n, g, dp[gmax+5], w[nmax+5], v[nmax+5];
int main()
{
    cin>>n>>g;
    for(int i=1;i<=n;i++)
        cin>>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]);

    cout<<dp[g];
    return 0;
}