#include <fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");

const int NMAX = 10005;

int N, W, Max, Gmax, Cmin, ok;
int P[NMAX], G[NMAX], Sol[NMAX];

int main()
{
    fin >> N >> W;
    for(int i = 1; i <= N; i++)
        fin >> P[i] >> G[i], Gmax += G[i];

    for(int i = 1; i <= N; i++) {
        if(ok) break;
        for(int j = Gmax - G[i]; j >= 0; j--) {
            if(Sol[j + G[i]] < Sol[j] + P[i])
                Sol[j + G[i]] = Sol[j] + P[i];
            if(Sol[j + G[i]] >= W)
                ok = 1;
        }
    }

    for(int i = 1; i <= Gmax; i++)
        if(Sol[i] >= W) {
            fout << i << '\n';
            break;
        }

    return 0;
}