#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
#define NMAX 5005
int n,g,w[NMAX], p[NMAX], dp[NMAX*2],i,j;
int main()
{
    cin>>n>>g;
    for(i=1; i<=n; i++)
        cin>>w[i]>>p[i];

    for(i=1; i<=n; i++)
        for(j=g; j>=w[i]; j--)
            dp[j]=max(dp[j], dp[j-w[i]] + p[i]);

    cout<<dp[g];
    return 0;
}