#include <fstream>

using namespace std;

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

int dp[10005];
int n, gmax, val, greutate;
int main()
{
    fin>>n>>gmax;
    for(int i=1; i<=n; i++)
    {
        fin>>greutate>>val;
        for(int j=gmax;j>=greutate;j--)
            dp[j]=max(dp[j-greutate]+val,dp[j]);
    }
    fout<<dp[gmax];
    return 0;
}