#include <fstream>
#include <climits>
using namespace std;
ifstream cin ("rucsac.in");
ofstream cout ("rucsac.out");
int dp[10010];
int main()
{
    int n,gmax,i,j,g,p,maxx;
    cin>>n>>gmax;
    for (i=1; i<=n; i++)
    {
        cin>>g>>p;
        for (j=gmax; j>=g; j--)
            dp[j]=max(dp[j-g]+p,dp[j]);
    }
    cout<<dp[gmax];
    return 0;
}