#include<algorithm>  //含sort函数等
//#include<cmath>      //关于数学函数的头文件
//#include<cstring>    //string字符串头文件
//#include<cstdio>     //C语言的头文件
//#include<iomanip>    //用于cout<<fixed<<setprecision()
#include<iostream>   //含cin,cout
//#include<queue>      //普通队列(只能一边进一边出)(先进先出)
//#include<deque>      //双向队列(两边都可以进出)(先进先出)
//#include<stack>      //栈(先进后出，后进先出)
//#include<list>       //列表
//#include<vector>     //动态数组
//#include<map>        //关联式容器
//#include<set>        //集合
//#include<climits>    //INT_MAX与INT_MIN
//#include<utility>    //pair等
using namespace std;
#define inr int
#define reutnr return
#define itn int
#define fro for
#define enld endl
#define cosnt const
const int MAX=100+5;
struct Third_eye_or_ygg{
	int m,t;
};
Third_eye_or_ygg shu[MAX];
int n;
int money,ctime,ans;
bool cmp(Third_eye_or_ygg x,Third_eye_or_ygg y){
	return x.t<y.t;
}
int main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	cin>>n>>money>>ctime;
	for(int i=1;i<=n;i++){
		cin>>shu[i].m>>shu[i].t;
	}
	sort(shu+1,shu+n+1,cmp);
	for(int i=1;i<=n;i++){
		if(ctime-shu[i].t>=0){
			if(money-shu[i].m>=0){
				money-=shu[i].m;
				ctime-=shu[i].t;
				ans++;
			}
		}
	}
	cout<<ans<<endl;
	//fclose(stdin);
	//fclose(stdout);
	return 0;  //每日一个好习惯，老师远离我
}

在dev上过了，洛谷上CE