This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define endl '\n'
#define int long long
#define pii pair<int,int>
#define vint vector<int>
#define se second
#define fi first
#define pb push_back
#define all(x) x.begin(), x.end()
using namespace std; 
int32_t main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int t = 1;
     //cin >> t;
    while (t--) {
        int n;
        cin >> n;
        vint a(n);
        vint bb(n);
        for (int i = 0;i < n;i++) {
            cin >> a[i]; cin >> bb[i];
        }
        int b = bb[0], cnt = 0; bool x = false;
        for (int i = 0; i < n; i++) {
            if (a[i] <= b) {
                cnt++;
            }
            if (a[i] == b) {
                x = true;
            }
        }
        if (x) {
            cout << cnt << endl;
        }
        else {
            cout << 0 << endl;
        }
    }
}
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