#include <bits/stdc++.h>
#define N 5005
#define G 10005
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

int n,g,w[N],p[N],dp[2][G];

void citire()
{
    in>>n>>g;
    for(int i=1;i<=n;i++)
    {
        in>>w[i]>>p[i];
    }
}
void dinamica()
{
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
        {
            if(j-w[i]>=0)
                dp[i%2][j]=max(dp[(i-1)%2][j],dp[(i-1)%2][j-w[i]]+p[i]);
            else
                dp[i%2][j]=dp[(i-1)%2][j];
        }
    }
    out<<dp[n%2][g];
}
int main()
{
    citire();
    dinamica();
    return 0;
}