include [HTML_REMOVED]

using namespace std;

const int N = 1010;

int n, m;
int f[N];

int main()
{
cin >> n >> m;
for (int i = 0; i < n; i ++ )
{
int v, w;
cin >> v >> w;
for (int j = m; j >= v; j – )
f[j] = max(f[j], f[j - v] + w);
}

cout << f[m] << endl;

return 0;

}