#include <bits/stdc++.h>

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int lim=1e4+10;
int n,g,i,w[lim],p[lim],dp[lim][3],k,mx;
int main()
{
    fin>>n>>g;
    for(i=1;i<=n;i++)
    {
        fin>>w[i]>>p[i];
    }

    for(i=1;i<=n;i++)
    for(k=1;k<=g;k++)
    {
        if(k<w[i])dp[k][i&1]=dp[k][(i-1)&1];
        else dp[k][i&1]=max(dp[k][(i-1)&1],p[i]+dp[k-w[i]][(i-1)&1]);
        mx=max(mx,dp[g][i&1]);
    }
    fout<<mx;
    return 0;
}