#include <fstream>
using namespace std;

ifstream is("energii.in");
ofstream os("energii.out");

int G, W;
int E[10001], C[10001];
int a[1001][5001];

int main()
{
    is >> G >> W;
	for ( int i = 1; i <= G; ++i )
		is >> E[i] >> C[i];
	for ( int i = 1; i <= G; ++i )
		for ( int j = 0; j <= W; ++j )
		{
			a[i][j] = a[i - 1][j];
			if ( j <= C[i] && a[i][j] < a[i - 1][j - C[i]] + C[i] )
				a[i][j] = a[i - 1][j - C[i]] + C[i];
		}
   /* for ( int i = 1; i <= G; ++i )
    {
        for ( int j = 0; j <= W; ++j )
            os << a[i][j] << ' ';
        os << '\n';
    }*/
    os << a[G][W];
    is.close();
    os.close();
    return 0;
}