#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,A,B; cin >> N >> A >> B;
    vector<vector<int>> dp(N+1,vector<int>(A+1,B+1));
    dp.at(0).at(0) = 0;
    for(int t=0; t<N; t++){
        int x,y; cin >> x >> y;
        for(int i=N-1; i>=0; i--) for(int k=0; k<=A-x; k++) dp.at(i+1).at(k+x) = min(dp.at(i+1).at(k+x),dp.at(i).at(k)+y);
    }
    int answer = 0;
    for(int i=1; i<=N; i++) for(auto b : dp.at(i)) if(b <= B) answer = i;
    cout << answer << endl;
}