#include <iostream>
#include <vector>
using namespace std;

int main() {
    int N, W;
    cin >> N >> W;

    vector<int> v(N), w(N);
    for (int i = 0; i < N; i++) {
        cin >> v[i] >> w[i];
    }

    const int INF = 1e9 + 7;
    const int MAX_V = 1000 * 1000 + 5;

    vector<int> dp(MAX_V, INF);
    dp[0] = 0;

    for (int i = 0; i < N; i++) {
        for (int j = MAX_V - 1; j >= v[i]; j--) {
            dp[j] = min(dp[j], dp[j - v[i]] + w[i]);
        }
    }

    int ans = -1;
    for (int i = MAX_V - 1; i >= 0; i--) {
        if (dp[i] <= W) {
            ans = i;
            break;
        }
    }

    cout << ans << endl;

    return 0;
}