#include <bits/stdc++.h>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
const int N = 5005;
const int G = 10005;
int dp[2][G],w[N],p[N];
int main()
{
    int n,g;
    in >> n >> g;
    for (int i = 1; i<=n; i++)
        in >> w[i] >> p[i];
    bool x = 1;
    for (int i = 1; i<=n; i++, x = !x)
        for (int j = 1; j<=g; j++)
            if (w[i]<=j)
                dp[x][j] = max(dp[!x][j],dp[!x][j-w[i]]+p[i]);
    out << dp[!x][g];
}