#include <bits/stdc++.h>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,gmax,dp[2][10005],g[5005],p[5005];
void citire()
{
    int i;
    in>>n>>gmax;
    for(i=1;i<=n;i++)
        in>>g[i]>>p[i];
}
void dinamica()
{
    int i,j;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gmax;j++)
        {
            if(j>=g[i])
                dp[i%2][j]=max(dp[(i-1)%2][j],dp[(i-1)%2][j-g[i]]+p[i]);
            else
                dp[i%2][j]=max(dp[i%2][j],dp[(i-1)%2][j]);
        }
    }
    out<<dp[n%2][gmax];
}
int main()
{
    citire();
    dinamica();
    return 0;
}