#include <fstream>

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[2][10001];
int maxi(int a,int b)
{
    if(a>=b) return a;
    return b;
}
int main()
{
    int n,g,i,a,b,j;
    fin>>n>>g;
    for(i=0;i<n;i++)
    {
        fin>>a>>b;
        for(j=0;j<=g;j++)
        {
            dp[(i+1)%2][j]=dp[i%2][j];
            if(a<=j) dp[(i+1)%2][j]=maxi(dp[i%2][j],dp[i%2][j-a]+b);
        }
    }
    fout<<dp[n%2][g];
}