#include <bits/stdc++.h>
using namespace std;
int main(void){
    int n,a,b;
    cin>>n>>a>>b;
    vector<vector<int>>dp(n+1,vector<int>(a+1,b+1));
    dp[0][0]=0;
    int ans=0;
    for(int i=0;i<n;i++){
        int x,y;
        cin>>x>>y;
        for(int j=i;j>=0;j--){
            for(int k=0;k<=a-x;k++){
                if(dp[j][k]+y<=b){
                    dp[j+1][k+x]=min(dp[j+1][k+x],dp[j][k]+y);
                    ans=max(ans,j+1);
                }
            }
        }
    }
    cout<<ans<<endl;
    return 0;
}