<题解>

#include <bits/stdc++.h>
using namespace std;

long long a[100010];
long long b[100010];
string s[100010];

int main() {
long long n, m;
cin >> n >> m;
b[0] = 0;
for (int i = 1; i <= n; i++) {
cin >> a[i] >> s[i];
b[i] = b[i - 1] + a[i]; // 记录每首歌的结束时间
}

int left = 1, right = n;
while (left < right) {
    int mid = (left + right) / 2;
    if (b[mid] < m) {
        left = mid + 1;
    } else {
        right = mid;
    }
}

cout << s[left] << endl;
return 0;

}