c#include <bits/stdc++.h> using namespace std; int main(){ cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false); int N, K; cin >> N >> K; for(int i = 0; i < N; i++){ int A, B; cin >> A >> B; K += A; K -= B; } cout << "비와이" << "\n"; return 0; }```