#include <iostream>
#include <fstream>

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

struct obiect{
    int w,p;
};
obiect v[5005];
int dp[10005][10005];
int main()
{
    int n,g;
    fin>>n>>g;
    dp[1][1]=1;
    for(int i=1;i<=n;i++)
        fin>>v[i].w>>v[i].p;

    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
        {
            int lin_c=i%2;
            int lin_a=(i-1)%2;
            if(j-v[i].w>=0)
                dp[lin_c][j]=dp[lin_a][j-v[i].w]+v[i].p;
            else dp[lin_c][j]=dp[lin_a][j];
        }
    }
    fout<<dp[n%2][g];
    return 0;
}