#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[10005][10005];
struct obiect{
int w,p;
}v[5005];
int main(){
    int n,g;
    fin>>n>>g;
    for(int i=1;i<=n;i++)
        fin>>v[i].w>>v[i].p;

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