#include <bits/stdc++.h>
using namespace std;
 
bool pass (long long n, long long k, unsigned long long& H) {
	unsigned long long tmp= pow(2, n-1);
	if (H<tmp) return 0;
	H=H-tmp+k;
	return 1;
}
 
bool solve (int t, unsigned long long& H) {
	while (t--) {
		long long n, k; cin >> n >> k;
		if (!pass(n, k, H)) return 0;
	}
	return 1;
}
 
int main () {
	int t;
	unsigned long long H;
	cin >> t >> H;
	if (solve(t, H)) cout << "hehe";
	else cout << "huhu";
}

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