문제
풀이
#include <iostream>
using namespace std;
void solve(void) {
int n; cin >> n;
int ans = 0;
for (int i=0; i<n; i++) {
int x; cin >> x;
int y; cin >> y;
if (5 * x - 3 * y > 40) ans++;
}
cout << ans << (ans == n ? "+" : "");
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}