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#include <iostream>
#include <fstream>
using namespace std;
long long dp[5001][10001], mat[5001][10001];
int main()
{
    ifstream f("rucsac.in");
    ofstream g("rucsac.out");
    int n,gmax;
    f>>n>>gmax;
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=2; j++)
        {
            f>>mat[i][j];
        }
    }
    
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=gmax; j++)
        {
            if(mat[i][1]>j)
            {
                dp[i][j]=dp[i-1][j];
            }
            else
            {
                dp[i][j]=max(dp[i-1][j-mat[i][1]]+mat[i][2], dp[i-1][j]);
            }
        }
    }
    
    g<<dp[n][gmax];

    return 0;
}