/* -*- coding: utf-8 -*-
 *
 * 3713.cc:  No.3713 豬ｷ蠎墓爾邏｢ - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 100;
const int MAX_A = 100;

/* typedef */

/* global variables */

int xs[MAX_N], ys[MAX_N];
int dp[MAX_N + 1][MAX_A + 1];

/* subroutines */

void setmin(int &a, int b) { if (a > b) a = b; }

/* main */

int main() {
  int n, a, b;
  scanf("%d%d%d", &n, &a, &b);
  for (int i = 0; i < n; i++) scanf("%d%d", xs + i, ys + i);

  for (int j = 0; j <= n; j++) fill(dp[j], dp[j] + (a + 1), b + 1);
  dp[0][0] = 0;

  for (int i = 0; i < n; i++)
    for (int j = n - 1; j >= 0; j--)
      for (int k = a - xs[i]; k >= 0; k--)
	if (dp[j][k] <= b)
	  setmin(dp[j + 1][k + xs[i]], dp[j][k] + ys[i]);

  int maxj = n;
  while (maxj > 0) {
    if (*min_element(dp[maxj], dp[maxj] + (a + 1)) <= b) break;
    maxj--;
  }

  printf("%d\n", maxj);
  
  return 0;
}