#include <iostream>
using namespace std;
int main() {
int M;
long long T;
cin >> M >> T;
long long mn = 1e10;
int ans = -1;
for (int i = 0; i < M; ++i) {
long long t;
int f;
cin >> t >> f;
if (T < t and t - T < mn) {
mn = t - T;
ans = f;
}
}
cout << ans << endl;
return 0;
}
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