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

int N,G;
int w[NMAX],p[NMAX];
int dp[GMAX],sol;
void citire()
{
    scanf("%d%d",&N,&G);
    for(int i=1;i<=N;i++)
    {
        int x,y;
        scanf("%d%d",&x,&y);
        w[i]=x;
        p[i]=y;
    }
}

void rezolvare()
{
    for(int i=1;i<=G;i++)
        dp[i]=-1;
    dp[0]=0;
    for(int i=1;i<=N;i++)
    {
        for(int cw = G;cw>=w[i];cw--)
            if(dp[cw]<dp[cw-w[i]]+p[i])
                    {
                        dp[cw]=dp[cw-w[i]]+p[i];
                    }

    }
}


int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    citire();
    rezolvare();
    cout<<dp[G];
    return 0;
}