#include <bits/stdc++.h>

#define VMAX 100
#define NMAX 5000
#define LOG 19
#define INF (long long)(10e9)
#define MOD 1000000007
#define ll long long int


#define NIL 0
#define CMAX 1000000

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");


int dp[2][2*NMAX+1];
int p[NMAX+1],w[NMAX+1],g;
int n;

int main()
{
    fin >> n >> g;
    for(int i=1;i<=n;i++)
    {
        fin >> w[i] >> p[i];
    }
    for(int i=1;i<=n;i++)
    {
        int curr=i%2;
        for(int j=0;j<=g;j++)
        {
            dp[curr][j] = dp[!curr][j];
            if(w[i]<=j)
            {
                dp[curr][j] = max(dp[curr][j],dp[!curr][j-w[i]]+p[i]);
            }
        }
    }
    int res=0;
    for(int i=1;i<=g;i++)
    {
        res=max(res,dp[n%2][i]);
    }
    fout << res;
}