#include <fstream>

using namespace std;

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

#define limn 5001
#define limg 10001
int w[limn], p[limn];
int n, G;
int dp[2][limg];

/**
    x = cond ? x_val_condTrue : x_val_condFalse;
**/

/// dp[i][j] = max(dp[i-1][j], dp[i-1][j-w[i]]+p[i])
/// res in dp[n][G]
int main()
{
    fin>>n>>G;
    for(int i=1; i<=n; i++)
        fin>>w[i]>>p[i];

    int lin = 0;
    ///alternam linia 0 si 1
    /// lin ^= 1 ( 0 ^ 1 = 1 , 1 ^ 1 = 0)
    for(int i=1; i<=n; i++, lin^=1)
        for(int j=0; j<=G; j++)
        {
            if(w[i] <= j)
                dp[lin][j] = max(dp[lin^1][j], dp[lin^1][j-w[i]]+p[i]);
            else
                dp[lin][j] = dp[lin^1][j];
            /// dp[i][j] = (w[i] <= j) ? max(dp[i-1][j], dp[i-1][j-w[i]]+p[i]) : dp[i-1][j];
        }
    fout<<dp[lin^1][G];
    return 0;
}