include [HTML_REMOVED]
using namespace std;
const int M = 1e3+9;
int N,V;
int f[M];
int v[M],w[M];
int main()
{
cin>>N>>V;
for(int i = 1;i<=N;i++)
scanf("%d%d",&v[i],&w[i]);
for(int i = 1;i<=N;i++)
for(int j = V;j>=v[i];j--)
{
f[j] = max(f[j-v[i]]+w[i],f[j]);
}
cout << f[V]<<endl;
return 0;
}