#include <iostream>
#include <cstdio>
#define NMAX 5005
#define GMAX 10005
using namespace std;

int N,G;
int g[NMAX];
int p[NMAX];
int dp[GMAX];

void citire()
{
    scanf("%d%d",&N,&G);
    for(int i=1;i<=N;i++)
        scanf("%d%d",&g[i],&p[i]);
}

void rezolvare()
{
    for(int i=g[1];i<=G;i++)
        dp[i]=p[1];
    for(int i=2;i<=N;i++)
    {
        for(int j=G;j>=g[i];j--)
            if(dp[j]<p[i]+dp[j-g[i]])
                dp[j]=p[i]+dp[j-g[i]];
    }
}

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    citire();
    rezolvare();
    cout<<dp[G];

    return 0;
}