#include <bits/stdc++.h>
#define nmax 1001
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int g[nmax],v[nmax],c[nmax][10001],n,gr;
void citire()
{fin>>n>>gr;
 for(int i=1;i<=n;i++)fin>>g[i]>>v[i];
}
void solve()
{int i,j;
   for(i=1;i<=n;i++)
        for(j=1;j<=gr;j++)
            if(g[i]>j)c[i][j]=c[i-1][j];
            else c[i][j]=max(c[i-1][j],v[i]+c[i-1][j-g[i]]);

 fout<<c[n][gr];
}
int main()
{   citire();
    solve();
    return 0;
}